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14 tháng 9 2021

1.       Because Tom is out, you don’t see him at home. (IF)

If Tom weren't out, you would see him at home

2.       The boy can’t go swimming because the weather is bad. (BUT FOR)

But for the bad weather, the boy could go swimming

3.       Minh doesn’t get rid of his job because he loves working with computers. (WITHOUT)

Minh can't work without computers

4.       Because my mother is here, I can ask for some money. (WERE)

If my mother weren't here, I couldn't asked her for some money

5.       The books are expensive. I can’t buy them. (BUT FOR)

But for the expensive books, I could buy them

20 tháng 9 2021

CÂU 4 WERE MÀ BẠN

 

Rewrite the sentences without changing the meaning. 1. He can’t go out because he has to study for his exam. → If .................................................................................................................................. 2. She is lazy so she can’t pass the exam. → If .................................................................................................................................. 3. He will pay me tonight; I will have enough money to buy a...
Đọc tiếp

Rewrite the sentences without changing the meaning.

1. He can’t go out because he has to study for his exam.

→ If ..................................................................................................................................

2. She is lazy so she can’t pass the exam.

→ If ..................................................................................................................................

3. He will pay me tonight; I will have enough money to buy a car.

→ If ..................................................................................................................................

4. He smokes too much; that’s why he can’t get rid of his cough.

→ If ..................................................................................................................................

5. She is very shy, so she doesn’t enjoy the party.

→ If ..................................................................................................................................

6. I get a work permit. I will stay for another month.

→ If ..................................................................................................................................

7. He doesn’t take any exercises. He is so unhealthy.

→ If ..................................................................................................................................

8. We can’t get the ticket because I don’t have the right change.

→ If ..................................................................................................................................

9. Study hard or you won’t pass the exam.

→ If ..................................................................................................................................

10. Don’t be impatient or you will make mistakes.

→ If ..................................................................................................................................

27
22 tháng 3 2021

Rewrite the sentences without changing the meaning.

1. He can’t go out because he has to study for his exam.

→ If he didn't have to study for his exam, he could go out

2. She is lazy so she can’t pass the exam.

→  If she weren’t lazy, she could pass the exam.

3. He will pay me tonight; I will have enough money to buy a car.

→ If he pays me tonight, I would have enough money to buy a car.

4. He smokes too much; that’s why he can’t get rid of his cough.

→ If  he didn't smoke too much, he would  get rid of his cough

5. She is very shy, so she doesn’t enjoy the party.

→ If she weren’t shy, she could enjoy the party.

6. I get a work permit. I will stay for another month.

→ If I get a work permit, I will stay for another month 

7. He doesn’t take any exercises. He is so unhealthy.

→ If he didn’t take any exercises, he is so unhealthy

8. We can’t get the ket because I don’t have the right change.

→ If I had the right change,we could get the ket

9. Study hard or you won’t pass the exam.

→ If you study hard, you would pass the exam

10. Don’t be impatient or you will make mistakes.

→ If you are impatient, you will make mistakes.

19 tháng 12 2021

1. The river which flows through Ho Chi Minh City is the Sai Gon River.

2. Mr Phong who is supposed to be at the meeting hasn’t come yet.

3. Our solar system is in a galaxy which is called the Milky Way.

4. I come from a city which is located in the southern part of the country.

5. I’ve recently gone back to the town where I was born.

6. Do you know the name of the hotel where John is staying?

7. There are some words which are very difficult to translate.

8. What is the name of the man whose car you borrowed?

9. This watch which I have lost costs a lot of money.

10. We were given a lot of information most of the which was useless.

28. Perhaps you see Nam at school now. Tell him to come back home.→ If………………………………………..….…….29. The doctor can’t see many patients because he is so late.→ If………………………………………..….…….30. We don’t visit them in Hanoi because tickets are expensive. → If………………………………………..….…….31. I’m busy right now, so I can’t help you.→ If………………………………………..….…….32. I didn’t buy it because I didn’t have enough money.→ If………………………………………..….…….33. I didn’t know that there was a test yesterday, so I didn’t study for it.→...
Đọc tiếp

28. Perhaps you see Nam at school now. Tell him to come back home.→ If………………………………………..….…….

29. The doctor can’t see many patients because he is so late.→ If………………………………………..….…….

30. We don’t visit them in Hanoi because tickets are expensive. → If………………………………………..….…….

31. I’m busy right now, so I can’t help you.→ If………………………………………..….…….

32. I didn’t buy it because I didn’t have enough money.→ If………………………………………..….…….

33. I didn’t know that there was a test yesterday, so I didn’t study for it.→ If……………………………………..….…….

34. Because he’s very thin, he feels the cold so much→ If………………………………………..….…….

35. I didn’t eat breakfast several hours ago, so I am hungry now→ If………………………………………..….…….

1
20 tháng 9 2021

28. Perhaps you see Nam at school now. Tell him to come back home.→ If……………you see Nam at school now, tell him to come back home.…………………………..….…….

29. The doctor can’t see many patients because he is so late.

→ If……the doctor weren't so late, he could see many patients …………………………………..….…….

30. We don’t visit them in Hanoi because tickets are expensive.

→ If………tickets weren't expensive, we would visit them in Hanoi………………………………..….…….

31. I’m busy right now, so I can’t help you.

→ If………I weren't busy right now, I could help you………………………………..….…….

32. I didn’t buy it because I didn’t have enough money.

→ If………I had had enough money, I would have bought it………………………………..….…….

33. I didn’t know that there was a test yesterday, so I didn’t study for it.

→ If…I had known that there was a test yesterday, I would have studied for ỉ…………………………………..….…….

34. Because he’s very thin, he feels the cold so much

→ If………he weren't thin, he wouldn't feel the cold so much………………………………..….…….

35. I didn’t eat breakfast several hours ago, so I am hungry now

→ If……I had eaten breakfast several hours ago, I wouldn't be hungry now…………………………………..….…….

Rewrite the sentences without changing their meaning 1. She cooks very well She is.... 2. They couldn't keep on clearing the beach because of heavy rain They couldn't keep on clearing the beach because........ 3. I bought a new typewrite. It cost me a lot of money I bought a new typewrite...... 4. Lan is one of my close friends. She is very intelligent Lan is one of my close friends...... 5. You are late. You lose your job If....... 6. You study hard. You pass the final...
Đọc tiếp

Rewrite the sentences without changing their meaning

1. She cooks very well

She is....

2. They couldn't keep on clearing the beach because of heavy rain

They couldn't keep on clearing the beach because........

3. I bought a new typewrite. It cost me a lot of money

I bought a new typewrite......

4. Lan is one of my close friends. She is very intelligent

Lan is one of my close friends......

5. You are late. You lose your job

If.......

6. You study hard. You pass the final exam

If.......

7. Tom is very good at tennis

Tom plays........

8. You should take excercise regularly because that's the way to get fit

If............

9. The teacher can't come to class today. He teaches us English

The teacher..........

10. I suggest that we should save money for the poor in the region

I suggest.......

11. He plays soccer skillfully

He is......

12. This is the woman. She can help you with your housrwork

This is the woman.........

13. His mother didn't understand him so she was angry with him

Because......

14. "Let's go to the cinema tonight" Tom suggests

Tom suggests.....

15. Get up now, or you will be late for class

If......

2
5 tháng 3 2019

1. She cooks very well

She is a good cook.

2. They couldn't keep on clearing the beach because of heavy rain

They couldn't keep on clearing the beach because it rained heavily.

3. I bought a new typewrite. It cost me a lot of money

I bought a new typewrite which costs me a lot of money.

4. Lan is one of my close friends. She is very intelligent

Lan is one of my close friends whom is very intelligent.

5. You are late. You lose your job

If you weren't late, you wouldn't lose your job.

6. You study hard. You pass the final exam

If you study hard, you will pass the final exam.

7. Tom is very good at tennis

Tom plays tennis well.

8. You should take excercise regularly because that's the way to get fit

If you take exercise regularly, you will get fit.

9. The teacher can't come to class today. He teaches us English

The teacher who teaches us English can't come to class today.

10. I suggest that we should save money for the poor in the region

I suggest saving money for the poor in the region.

11. He plays soccer skillfully

He is a skillful soccer player.

12. This is the woman. She can help you with your housrwork

This is the woman whom can help you with your housework.

13. His mother didn't understand him so she was angry with him

Because his mother didn't understand him, she was angry with him.

14. "Let's go to the cinema tonight" Tom suggests

Tom suggests going to the cinema tonight.

15. Get up now, or you will be late for class

If you don't get up now, you will be late for school.

31 tháng 3 2021

1. She is a good cook/ very good at cooking.

2. They couldn't keep on clearing the beach because it rained heavily.

3. I bought a new typewrite which costs me a lot of money.

4.Lan is one of my close friends whom is very intelligent.

5. If you weren't late, you wouldn't lose your job.

6. If you study hard, you will pass the final exam.

7. Tom plays tennis very well.

8. If you take exercise regularly, you will get fit.

9. The teacher who teaches us English can't come to class today.

10. I suggest saving money for the poor in the region.

11. He is a skillful soccer player.

12. This is the woman whom can help you with your housework.

13. Because his mother didn't understand him, she was angry with him.

14.Tom suggests going to the cinema tonight.

15. If you don't get up now, you will be late for school.

*Practice: Complete the sentences with “because/as/since, if, unless, when, so”.1. We decided to go out for a meal ____________ we had no food at home.2. He has a very important job ____________ he is particularly well-paid.3. Can I borrow that book ____________ you’ve finished it?4. You canh drive a car ____________ you've got a license.5. No one was watching the television ____________ I switched the television off.6. ____________ she changed a lot, we didn't recognize her.7....
Đọc tiếp

*Practice: Complete the sentences with “because/as/since, if, unless, when, so”.1. We decided to go out for a meal ____________ we had no food at home.

2. He has a very important job ____________ he is particularly well-paid.

3. Can I borrow that book ____________ you’ve finished it?

4. You canh drive a car ____________ you've got a license.

5. No one was watching the television ____________ I switched the television off.

6. ____________ she changed a lot, we didn't recognize her.

7. ____________ you're ready, we can start now.

8. I'm going away for a few days. I’ll phone you ____________ I get back.

9. You should inform the police ____________ your bicycle is stolen.

10. Matthew went to bed ____________ it was too late to go out
* Practice: Rewrite the following sentences with BECAUSE / BECAUSE OF.

1. He couldn’t meet you because of being busy

.............................................................................................................................................................................................

2. Nobody can do this test because of its difficulty

.........................................................................................................................................................................................................

3. She went to bed early because of her sickness

.........................................................................................................................................................................................................

4. Two cars canh pass each other because the road is narrow

.........................................................................................................................................................................................................

5. We spent the whole day in the garden because the weather is lovely.

.........................................................................................................................................................................................................

6. We can’t swim in this part of the river because the water is highly polluted.

.........................................................................................................................................................................................................
Ex: Although/ though/ even though it was raining, we went out.= We went out although/ though/ even though it was raining.

* Practice:

1. He is very rich. He is not happy. (although).

........................................................................................................................................................................................................

2. He tried. He was not successful. (though).

........................................................................................................................................................................................................

3. He got good jobs. He was not satisfied. (even though).

........................................................................................................................................................................................................

4. He often tells lies. Mary believes him. (although).

........................................................................................................................................................................................................

5. She can’t answer my question. She is very intelligent. (although).

........................................................................................................................................................................................................

6. The weather changed, but the picnic went ahead as planned. (though).

........................................................................................................................................................................................................
 

3
21 tháng 6 2019

1. We decided to go out for a meal _____because_______ we had no food at home.

2. He has a very important job ___so_________ he is parularly well-paid.

3. Can I borrow that book _____when _______ you’ve finished it?

4. You can drive a car _____if_______ you've got a license.

5. No one was watching the television _____so_______ I switched the television off.

6. ______Because______ she changed a lot, we didn't recognize her.

7. ______Unless______ you're ready, we can start now.

8. I'm going away for a few days. I’ll phone you _____when _______ I get back.

9. You should inform the police ____if________ your bicycle is stolen.

10. Matthew went to bed ______because______ it was too late to go out

21 tháng 6 2019

1. He couldn’t meet you because of being busy

...He couldn’t meet you because he was busy .............................................................................................

2. Nobody can do this test because of its difficulty

.........Nobody can do this test because it 's difficult........................................................................

3. She went to bed early because of her sickness

....... She went to bed early because she was sick...........................

4. Two cars can't pass each other because the road is narrow

..........Two cars can't pass each other because of the narrow road.............................................................

5. We spent the whole day in the garden because the weather is lovely.

..............We spent the whole day in the garden because of the lovely wheather ...............................

6. We can’t swim in this part of the river because the water is highly polluted.

.........We can’t swim in this part of the river because of the fact that the water is highly polluted........................................

13 tháng 4 2019

1. They decided to go out. It rained heavily. (Although)
-->They decided to go out although it rained heavily.
2. Why don't we go to school by bike instead of motorbike to save energy ? ( I suggest )
-->I suggest going to school by bike instead of motorbike to save energy.
3. He can't buy that bike because he doesn't have enough money (If )
-->If he had enough money, He could buy that bike.
4.The flowers are rose. I bought them for my mother ( which )
-->The flowers which I bought them for my mother are rose.
5. The boy is standing near the tree. He is my brother. ( who )
-->The boy who is standing near the tree is my brother.
6. I don't think he is strong. He can't lift the box.
-->I don't think he is strong because he can't lift the box.
7.His house is big. It is not very far from here.
-->His house is big and it is not very far from here.
8. You must plant your work carefully.
-->You work must be planted carefully.
9. I am very busy. I can't go with you
-->If I wasn't very busy, I could go with you.

1. Eating is not allowed in the classroom. Students are not__________________________________________________________ 2. Tania will probably turn down the job in London Tania is not likely_________________________________________________________ 3. The Smiths moved to Cambridge six years ago. The Smiths have__________________________________________________________ 4. Jack couldn’t manage to persuade his father to let him borrow the car. Jack didn’t...
Đọc tiếp

1. Eating is not allowed in the classroom. Students are not__________________________________________________________

2. Tania will probably turn down the job in London

Tania is not likely_________________________________________________________ 3. The Smiths moved to Cambridge six years ago. The Smiths have__________________________________________________________ 4. Jack couldn’t manage to persuade his father to let him borrow the car. Jack didn’t succeed_______________________________________________________ 5. His parents think that being a doctor would be a good career for him. His parents want__________________________________________________________ 6. You mustn’t enter that room without permission. You are not______________________________________________________________ 7. I don’t have enough money for them, but I like to buy expensive shoes. Although I don’t_________________________________________________________ 8. There is more rain in the north of the country than in the south. The north of the country___________________________________________________ 9. Can you give me any reason for her success in her career? Can you explain why_____________________________________________________? 10. I missed the bus because I overslept. If I hadn’t_______________________________________________________________
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The present perfect and the simple past Put the verbs in brackets into the present perfect or the simple past tense. 1 This is my house. ~How long you (live) here? ~ I (live) here since 1970. 2 He (live) in London for two years and then (go) to Edinburgh. 5 Shakespeare (write) a lot of plays. 6 My brother (write) several plays. He just (finish) his second tragedy. 7 I (fly) over Loch Ness last week. ~You (see) the Loch Ness monster? 8 I (not see) him for three years. I wonder where he...
Đọc tiếp

The present perfect and the simple past

Put the verbs in brackets into the present perfect or the simple past tense.

1 This is my house. ~How long you (live) here? ~ I (live) here since 1970.

2 He (live) in London for two years and then (go) to Edinburgh.

5 Shakespeare (write) a lot of plays.

6 My brother (write) several plays. He just (finish) his second tragedy.

7 I (fly) over Loch Ness last week. ~You (see) the Loch Ness monster?

8 I (not see) him for three years. I wonder where he is.

9 He (not smoke) for two weeks. He is trying to give it up.

10 Chopin (compose) some of his music in Majorca.

11 When he (arrive)? ~ He (arrive) at 2.00.

12 You (lock) the door before you left the house?

13 I (read) his books when I was at school. I (enjoy) them very much.

14 I can't go out because I (not finish) my work.

15 I never (drink) whisky. ~Well, have some now.

16 I (write) the letter but I can't find a stamp.

17 The clock is slow. ~It isn't slow, it (stop).

18 Here are your shoes; I just (clean) them.

19 I (leave) home at 8.00 and (get) here at 12.00.

20 I (do) this sort of work when I (be) an apprentice.

21 He just (go) out.

22 He (go) out ten minutes ago.

23 You (have) breakfast yet? ~ Yes, I (have) it at 7.00.

2
5 tháng 9 2018

The present perfect and the simple past

Put the verbs in brackets into the present perfect or the simple past tense.

1 This is my house. ~How long have you (live)lived here? ~ I have lived(live) here since 1970.

2 He (live)has lived in London for two years and then (go)went to Edinburgh.

5 Shakespeare (write)wrote a lot of plays.

6 My brother (write)has written several plays. He has just (finish)finished his second tragedy.

7 I (fly)flew over Loch Ness last week. ~Did You (see)see the Loch Ness monster?

8 I (not see)haven't seen him for three years. I wonder where he is.

9 He (not smoke)hasn't smoked for two weeks. He is trying to give it up.

10 Chopin (compose)composed some of his music in Majorca.

11 When did he (arrive)arrive? ~ He (arrive)arrived at 2.00.

12 Had You (lock)locked the door before you left the house?

13 I (read)read his books when I was at school. I (enjoy)enjoyed them very much.

14 I can't go out because I (not finish)haven't finished my work.

15 I have never (drink)drunk whisky. ~Well, have some now.

16 I (write)wrote the letter but I can't find a stamp.

17 The clock is slow. ~It isn't slow, it (stop)stopped.

18 Here are your shoes; I have just (clean)cleaned them.

19 I (leave)left home at 8.00 and (get)got here at 12.00.

20 I (do)did this sort of work when I (be)was an apprentice.

21 He has just (go)gone out.

22 He (go)went out ten minutes ago.

23 Have you (have)had breakfast yet? ~ Yes, I (have)have had it at 7.00.

5 tháng 9 2018

1 This is my house. ~How long have you (live) lived here? ~ I (live)have lived here since 1970.

2 He (live)has lived in London for two years and then (go)went to Edinburgh.

5 Shakespeare (write)wrote a lot of plays.

6 My brother (write)has written several plays. He has just (finish)finished his second tragedy.

7 I (fly)flew over Loch Ness last week. ~did You (see)see the Loch Ness monster?

8 I (not see)haven't seen him for three years. I wonder where he is.

9 He (not smoke)hasn't smoked for two weeks. He is trying to give it up.

10 Chopin (compose)composed some of his music in Majorca.

Finish each of the following sentences in such a way that it is as similar as possible in meaning to the original sentence. 1. I didn’t know that you were in the hospital, so I didn’t visit you. → If ____________________________________________. 2. Hurry up or you will be late. → If ____________________________________________. 3. She is very busy, so she can’t help me now. → If ____________________________________________. 4. He didn’t phone me because he didn’t know my...
Đọc tiếp

Finish each of the following sentences in such a way that it is as similar as possible in meaning to the original sentence.

1. I didn’t know that you were in the hospital, so I didn’t visit you.

→ If ____________________________________________.

2. Hurry up or you will be late.

→ If ____________________________________________.

3. She is very busy, so she can’t help me now.

→ If ____________________________________________.

4. He didn’t phone me because he didn’t know my phone number.

→ If ____________________________________________.

5. You’re unfit because you don’t take exercise.

→ If ____________________________________________.

6. Unless you are careful, you will cut yourself with that knife.

→ If ____________________________________________.

7. If I have time, I’ll help you.

→ Unless ____________________________________________.

8. He didn’t study his lessons very carefully, so he gets bad marks now.

→ If ____________________________________________.

9. Dick often causes accidents because he drives carelessly.

→ If ____________________________________________.

10. I can’t apply for that job because I don’t know English.

→ If ____________________________________________.

36
22 tháng 4 2021

* Vì đây là chương trình Anh lớp 9 nên chưa nắm rõ, có gì sai sót mong AD thông cảm ạ *

Finish each of the following sentences in such a way that it is as similar as possible in meaning to the original sentence.

1. I didn’t know that you were in the hospital, so I didn’t visit you.

→ If I had known that you were in hospital, I would have visited you.

2. Hurry up or you will be late.

→ If you don't hurry up, you wil be late.

3. She is very busy, so she can’t help me now.

→ If she weren't very busy, she could help me now.

4. He didn’t phone me because he didn’t know my phone number.

→ If he had known my phone number, he would have phoned me.

5. You’re unfit because you don’t take exercise.

→ If you took more exercise, you would be fit.

6. Unless you are careful, you will cut yourself with that knife.

→ If you aren't careful, you will cut yourself with that knife.

7. If I have time, I’ll help you.

→ Unless I have time, I won't help you.

8. He didn’t study his lessons very carefully, so he gets bad marks now.

→ If he had studied his lesson very carefully, he wouldn't get bad marks now.

9. Dick often causes accidents because he drives carelessly.

→ Dick drove carefully , he wouldn't often cause accidents .

10. I can’t apply for that job because I don’t know English.

→ If I knew English, I could apply for that job.

20 tháng 11 2021
 

1.If I had konwn tha you were in hospital, I would have visited you.

2.If you don't hunrry up, you will be late.

3.If she weren 't very busy, she could help my now.

4.If he had konwn my phone number, he would have phoned me

5.If you took exercise, you would be fit unfit.

6.If you are not,you will cut with that knife.

7.Unless I have time, I won't help you.

8.If he had studied his lessons very carefully, he woudn't get bad marks now.

9.If dick drove carefully, he wouldn't cause acciddent .

10.If I knew English, I could apply for that jop.

Rewrite the following sentences without changing their meaning 1. They are good at playing soccer They play...... 2. Because of the bad weather, we cancelled the trip Because....... 3. Let's go out for a walk I suggest...... 4. The boy can't pass the test because he doesn't work hard If........ 5. I have written a letter for my Mom A......... 6. People feed cows in the morning Cows....... 7. The man is kind. He gave me some food The man........ 8. My sons learns English well My...
Đọc tiếp

Rewrite the following sentences without changing their meaning

1. They are good at playing soccer

They play......

2. Because of the bad weather, we cancelled the trip

Because.......

3. Let's go out for a walk

I suggest......

4. The boy can't pass the test because he doesn't work hard

If........

5. I have written a letter for my Mom

A.........

6. People feed cows in the morning

Cows.......

7. The man is kind. He gave me some food

The man........

8. My sons learns English well

My son is.......

9. In spite of the bad weather, they went on a trip

Though......

10 We finished the test twenty minutes ago

We have......

11. Practise speaking English regularly, so your English will improve

If you......

12. I regret Marta isn't here now

I wish........

13. "Let's go to the swimming pool" Nick said

Nick suggested

14. She was hungry so she had a big lunch

Because.......

15. I was tired but I couldn't sleep

Although ...........

16. We can't afford energy saving light bulbs. The light bulbs are too expensive

We can't afford energy saving light bulbs ........

17. Turn off the light, or you will waste electricity

If you.......

18. Tom is very good at volleyball

Tom plays......

19. They are very clever workers

He works .......

20. They cooks very well

They are........

2
5 tháng 3 2019

1. They are good at playing soccer

They play soccer well

2. Because of the bad weather, we cancelled the trip

Because the weather was bad, we cancelled the trip

3. Let's go out for a walk

I suggest going for a walk

4. The boy can't pass the test because he doesn't work hard

If the boy had worked hard, he could have pass the text

5. I have written a letter for my Mom

A letter has been written for my mom by me

6. People feed cows in the morning

Cows are fed by people in the morning

7. The man is kind. He gave me some food

The man who gave me some food is kind

8. My sons learns English well

My son is a good English learner

9. In spite of the bad weather, they went on a trip

Though the weather was bad, they went on a trip

10 We finished the test twenty minutes ago

We have finished the test for 12 mins ago

11. Practise speaking English regularly, so your English will improve

If you speak E regularly, your English will improve

12. I regret Marta isn't here now

I wish........

13. "Let's go to the swimming pool" Nick said

Nick suggested

14. She was hungry so she had a big lunch

Because.......

15. I was tired but I couldn't sleep

Although ...........

16. We can't afford energy saving light bulbs. The light bulbs are too expensive

We can't afford energy saving light bulbs ........

17. Turn off the light, or you will waste electricity

If you.......

18. Tom is very good at volleyball

Tom plays......

19. They are very clever workers

He works .......

20. They cooks very well

They are........

5 tháng 3 2019

Thiếu :v

12. I regret Marta isn't here now

I wish Maria was here now

13. "Let's go to the swimming pool" Nick said

Nick suggested going to the swimming pool

14. She was hungry so she had a big lunch

Because she was hungry, she had a big lunch

15. I was tired but I couldn't sleep

Although I was tired, I couldn't sleep

16. We can't afford energy saving light bulbs. The light bulbs are too expensive

We can't afford energy saving light bulbs because they are too expensive

17. Turn off the light, or you will waste electricity

If you turn off the light, you won't waste electricity

18. Tom is very good at volleyball

Tom plays volleyball very well

19. They are very clever workers

He works in the clever way

20. They cooks very well

They are good cooks