I. Rewrite each of the following sentences in another way so that it means almost the same as the sentence printed before it:
1. Be quiet or you will not understand the lesson.
→ If ___________________________________________________________________
2. Study harder and you will not fail the coming exam.
→ If ___________________________________________________________________
3. Work harder or you won’t get high salary.
→ If ___________________________________________________________________
4. Practice speaking English every day or you can’t improve your English.
→ If ___________________________________________________________________
5. The children like to walk in the rain.
→ The children enjoy _____________________________________________________
→ The children are _______________________________________________________
6. I think surfing the Net is useful.
→ I find it_______________________________________________________________
7. I don’t think she broke the vase accidentally.
→ I think _______________________________________________________________
8. Watching TV consumes a lot of time.
→ Watching TV is a ______________________________________________________
9. Can’t you control the child?
→ You ________________________________________________________________ ?
10. “I don’t know anything about it,” he said.
→ He denied ____________________________________________________________
11. Did they understand the problem?
→ They hardly__________________________________________________________ ?
12. He forced me to put my hands up and quickly searched through my pockets.
→ I ____________________________________________________________________
13. “Don’t forget to phone the office,” she told him.
→ She reminded _________________________________________________________
14. Mary will watch the film in three hours.
→ It will ________________________________________________________________
15. The children are excited about going to the circus.
→ The children are looking_________________________________________________
16. He is interested in reading detective books.
→ He enjoys _____________________________________________________________
17. Do you find it difficult to speak English?
→ Do you have any _______________________________________________________
18. My father needs 15 minutes to read “Tuoi Tre” newspaper every morning.
→ My father spends_______________________________________________________
19. The floor was cleaned by Loan
→ Loan_________________________________________________________________
20. The Browns last painted the living-room two years ago.
→ The Browns have ______________________________________________________
21. Would you close the door, please?
→ Would you mind ______________________________________________________ ?
22. They didn’t allow us to smoke here.
→ They didn’t let _________________________________________________________
23. My teacher advised buying that book.
→ My teacher advised us ___________________________________________________
24. He has studied English for six years.
→ He began _____________________________________________________________
25. It is necessary to master English.
→ Mastering ____________________________________________________________
26. He spent two hours writing the essay.
→ It took _______________________________________________________________
27. He expects to hear from her as soon as possible.
→ He is looking __________________________________________________________
28. I would like you to help me (to) put the chairs away?
→ Do you mind _________________________________________________________ ?
29. Don’t forget that you have to do this homework.
→ Please remember _______________________________________________________
30. Don’t ask so many questions.
→ Please stop ____________________________________________________________
31. He hasn’t smoked for 3 years.
→ He stopped ____________________________________________________________
32. It's not a good idea to travel during the rush hour.
→ It's better to____________________________________________________________
Tự vẽ hình nha.
c. Ta có: \(\left\{{}\begin{matrix}\widehat{BFA}=\widehat{FIA}+\widehat{IAF}\\\widehat{FAB}=\widehat{MAB}+\widehat{FAM}\end{matrix}\right.\)
Mà \(\widehat{FIA}=\widehat{MAB}\) (Cùng phụ \(\widehat{ABI}\) )
Và \(\widehat{IAF}=\widehat{FAM}\) (gt)
\(\Rightarrow\widehat{BFA}=\widehat{FAB}\) Hay \(\Delta ABF\) cân tại B.
Mà \(BE\perp AF\) ( \(\widehat{AEB}=90^0\) )
Nên \(AE=EF\) (1)
Ta lại có: \(\left\{{}\begin{matrix}HK\perp AE\\\widehat{HAE}=\widehat{KAE}\end{matrix}\right.\) Suy ra \(\Delta AHK\) là tg cân.
\(\Rightarrow HE=EK\) (2)
Từ (1)(2)suy ra \(AHFK\) là hình bình hành.
\(\Rightarrow FK//IA\)
Hay \(AIFK\:\) là hình thang. Để AIFK nội tiếp được đường tròn thì \(\widehat{BIA}=\widehat{IAM}\) \(\Rightarrow\widehat{BIA}=\widehat{ABI}\) \(\Rightarrow\widehat{MBA}=\widehat{MAB}=45^0\)
Hay M là điểm chính giữa cung AB./.
Có gì không hiểu cứ hỏi mình nha. !
Exercise 4 :
2, When I slow, I will late for the flight.