4. If everyone (recycle) paper, metal and glass, we ______________ (not produce) so much rubbish.
5. If you ______________ (not water) plants, they ______________ (die).
6. If the weather ______________ (be) bad, we ______________ (not go) to the park.
7. We ______________ (save) thousands of trees if we ______________ (not waste) so much paper.
8. What ______________ (happen) if we ______________ (keep) polluting the environment.
9. If we ______________ (not stop) cutting down so many trees, we ______________ (endanger) our oxygen supply.
10. If people ______________ (dump) chemicals into rivers, they ______________ (not be) able to swim in them in the future.
phy is much ______________ than science.
II. Rewrite the following sentences
1. You should work hard, or you won’t pass the exam.
→If __________________________________________________
2. Henry fails his examination. His parents will be sad.
→If __________________________________________________
3. Sue shouldn’t go out this weekend, or she won’t have time to study.
→If __________________________________________________
4. I think it’ll snow tomorrow. I will go skiing.
→If __________________________________________________
5. He should leave soon, or he’ll miss the bus.
→If __________________________________________________
6. Don’t play with matches. You will hurt yourself.
→If __________________________________________________
7. We will plant more trees. The air will be fresher.
→If we ________________________________________________
8. We will use fewer cars. We will reduce pollution.
→If we ________________________________________________
9. We will cycle to school every day. We will keep fitter.
→If we ________________________________________________
10. We will use recycled products. We will save money.
→If we ________________________________________________
11. People will throw rubbish into the right bin. They will keep the environment clean.
→If people _____________________________________________
12. We will turn off the tap when brushing the teeth. We will save a lot of water.
→If __________________________________________________
13. People will travel more by public transport. The harmful gases in big cities will be reduced.
→If __________________________________________________
14. We will start at 6.00. We will arrive there before noon.
→If __________________________________________________
15. The boy eats so may green apples. He will be ill.
→If __________________________________________________
III. Put the verbs in brackets into the correct form.
1. If you __________ (expose) phosphorus to air, It __________ (burn)
1. If you __________ (heat) ice, it __________ (turn) to water.
2. If metal __________ (get) hot, it __________ (expand)
3. If you __________ (stand) in the rain, You __________ (get) wet
4. If anyone __________ (ring) the bell, don’t __________ (open) the door.
5. If my father __________ (not, sleep) well, he __________ (drink) coffee before going to bed
6. If you__________ (press) this button, the machine __________ (stop)
7. If you__________ (multiply) 6 to 8, you__________ (get) 48
8. If anyone __________ (call), say that I__________ (be, not) at home.
9. If you__________ (go) to the Post Office, you__________ (mail) this letter for me.
IV. Put the verbs in brackets into the correct form.
1) If we __________ (to send) an invitation, our friends __________ (to come) to our party.
2) He __________ (not/to understand) you if you __________ (to whisper).
3) They __________ (not/to survive) in the desert if they __________ (not/to take) extra water with them.
4) If you __________ (to press) CTRL + s, you __________ (to save) the file.
5) You __________ (to cross) the Channel if you __________ (to fly) from Paris to London.
6) Fred __________ (to answer) the phone if his wife __________ (to have) a bath.
7) If Claire __________ (to wear) this dress at the party, our guests __________ (not/to stay) any longer.
8) If I __________ (to touch) this snake, my girlfriend __________ (not/to scream).
9) She __________ (to forget) to pick you up if you __________ (not/to phone) her.
10) I __________ (to remember) you if you __________ (to give) me a photo.
