1. You (be)will be late for school if you (not go)don't go now

2. I( help)will help you with the homework if i (be)am free

3. There (be)will be big floods every year if we (cut)cut down too many trees in the forests

4. If we (not stop)don't stop littering, the environment (become)will become more and more polluted

5. She (pay)will pay 50,000 dong if she (use)uses 2 energy-saving bulbs

6. If i (see)see him, i (give)will give him a lift

7. The table (will collapse)will collapse if you (stand)stand on it

8. If he (eat)eats all that, he (be)will be ill

9. What (happen)happen if the pollution (go)goes on?

10. If the work (not finish)doesn't finish on time, we (fire)will fire you

11. If we (not stop)don't stop smoking, you (die)will die soon

12. The electricity will be cut off if you (not pay)don't pay the bill within 2 days

13. If it ( not rain)won't rain tomorrow, we (come)will come to visit them

II/ give the correct verb form or tense

1. I (see) ....saw.........a terrible accident on my way home yesterday

2. My sister (live).....has lived......in Pairs since she was six

3. I would like you (take).....to take.....good care of the garden

4. If he (not try)........doesn't try......to study harder, he will fail the next exam

5. What (happen).....will happen...... if the pollution (go)..goes........on?

6. It is interesting (go) .....to go.......swimming in hot summer months

7. If she (stop) .....stops........working hard, her health (become)......will become.. better

8. Her son ( come) ....came.........to class late 2 days ago

9. I can't go out with you because i (not finish) .......haven't finished.....my homework yet

10. I (tell)......will tell...her to phone you if she (come) ....comes.......here tomorrow

11. Let's (reduce).....reduce...... the amount of water our family uses

12. He (leave)........left... HaNoi in 1998, and we (not see).....haven't seen....him since them

II/ give the correct tense or form of the verb in bracket

1. If you (not stop)......don't stop.......smoking, you health will become worse

2. What (happen)........will happen... to the environment if people go on littering?

3. If we (not be)......aren't .....careful, we won't be able to pass the exam

4. I suggest ( not travel)...not travelling........ by motorbike to reduce air pollution

5. ......have.........you (finish)......finished.....the letter yet?

6. I suggest (send)......sending ......these bottles for recycling

7. My uncle (live)...has lived.......in pairs since he was twenty years old

8. If it rains tomorrow, we (have).....will have ......to canel our picnic

9. How about (have).....having...... a mechanic check our car ?

10. I (see)......saw... a terrible accident on my way to work yesterday

11. I am disappointed that you (not write).......haven' t written...... to me for many years

12. She ( be).......was....at home last night, but she (not answer)....didn't answer........... the phone

13. Let's (stop)......stop........using dynamite for fishing

14. He (leave) .......left.....Hanoi in 1975, and we ( not see)....haven't seen.........since them

15. He will be able to pass the next exam if she (study)....studies.....harder

16. If she (come).......comes.....here tomorrow, i (tell)..will tell.......you

17. Jeans (wear)..were worn........by many university in the 1960s

18. We (have) ......have had.........these pets since 2002

1. Could you tell me what are the problems on the delivery?

=> Could you tell me what are the problems with the delivery?         

2. who should we talk to about this broke TV?
=> who should we talk to about this broken TV

IV / rewrite the tense

1. I started going to work by bus 3 months ago

-> i have.gone to work by bus for 3 months..

2. Don't drink coffee oe you won't be able to sleep

-> if .you drink coffee , you won't be able to sleep..

3. We last visited Nha Trang city in 1988

-> we haven't..visited Nha trang city since 1988.

4. Stop polluting the rivers or we will have no fresh water to use in a few decades

-> if.you pollute the rivers , we won;t have no fresh water to use in a few decades ..

5. Study harder or you will fail in the next examination

-> if.you study hard you will pass in the next examination..

6. The last time they saw their uncle was three years ago

-> they haven't.seen their uncle for three years..

7. If it doesn't rain tomorrow, we will go on a picnic

-> unless..it rains tomorrow , we will go on a picnic..

8. If i am not busy this evening, i will help you do the homework

-> unless..i am busy this evening , .i will help you do the homework

9. Unless you study harder, you cangot pass the exam

-> if..you you study harder, you can pass the exam.

10. She will miss the train unless she comes before 10 pm

-> if.she doesn't come before 10 pm, She will miss the train

Ex1 : 

1.Air pollution can contaminate directly of bodies water and soil of  the surface 

2.We will waste so much paper if we don't save thousands of trees .

3.What đo you really got if air pollution would be bad ?

4. Polluted water causes sach as the death of fish and crab ,aqua,animals . 

5. If we recycle more rubbish ,it went to less landfill sites .

6.Agriculture has been impacted due to the overuse of chemicals on land pollution

7.Too much light is used in cities may cause of light pollution electric 

8. Water pollution is one of the most serious enviroment problems of our time

1. if she leaves now, she (not be)..won't be..late
2. if people don't protect the animals, they (kill)..will be killed..
3. If you ( not pass).don't pass..the driving test, we will be disappointed
4. what ( happen).will happen.if the pollution goes on?
5. if they ( stop)..stop.using dynamite for fishing, a lot of aquatic creatures will be well-preserved
6. if pollution increases, more and trees (die).will die..
7. if it rains tonight, he ( not go ).won't go..for a walk
8. if Mai ( be ).is.. late, we ( wait )..will wait. for her
9. No one ( help ).will help..him if he ( not help).doesn't help. himself
10. if the Earth ( be )..is.warmer, the sea level (rise).rises..
11. unless it ( rain).rains..,we will go shopping
12. unless Lan (have)has..something to do, she won't  stay at home
13. you will be late if you ( not hurry).don't hurry..
14. unless she (study).studies.hard< she will fail the exam
15. we ( go).will go.out if the rain ( stop).stops.
16.If people ( use).use.the car all the time, they ( make).will make..the air dirty
17. if we (not,waste).don't waste..so much paper, a lot of tress ( save).will be saved..
18. You ( remember).will remember..all the answers if you're  more patient
19. if you see some students throw trash in the class, what will you ( do ).do...?
20. if people plant more trees, the air ( not,pollute)..won't be polluted...

cau1:If you don't try your best,you the next exam. A:will fail. B:fails. C:would come. D:would have come.

cau2:If each person one more tree,the pollution problem worldwide would be solved.

A:plants. B:planted. C:had planted. D:will plant.

cau3:If our teacher were here now,he us with this difficult exercise.

A:has helped. B:helps. C:will help. D:would help.

cau4:If anyone ,please tell them I'm not at work today.

A:will call. B:should call. C:called. D:calls.

cau5:If you an important decision,you will think carefully.

A:work. B:make. C:expect. D:do.

cau6:You'll get pneumonia you your wet clothes.

A:should-not change. B:don't-change. C:were-not to change. D:had you not changed.

cau7::she able to walk faster If her shoes didn't have such high heels.

A:could be. B:couldn't be. C:were. D:had been.

cau8:I things on the installment system if I were you.

A:wouldn't buy. B:don't buy. C:won't buy. D: wouldn't have bought.

cau9:If anyone attacks me, my dear dog at his throat.

A:would bite. B:will bite. C:bit. D:had bitten.

cau10:I'll pay you double if you the work finished by friday.

A:get. B:got. C: had got. D:are getting.

cau11:had I known that you were in hospital,I you. A:would visit. B:will visit. C:would have visited. D: visit.

cau12:you won't make better progress unless you class regulary. A:attend. B:attended. C:don't attend. D:didn't attend.

cau13:If you ten minutes earlier,you would have a seat in the auditorium. A:arrive. B:arrived. C:had arived. D:arrives.

cau14:If he hard,he the coming exam.

A:stidied/would pass. B:doesn't study/ will surely pass.

C:studies/can pass. D:hadn't studied/wouldn't have passed.

cau15:If she asked you for hep, ?

A:would you accept. B:you accept. C:will you accept. D:do you accept.

cau1:If you don't try your best,you the next exam. A:will fail. B:fails. C:would come. D:would have come.

cau2:If each person one more tree,the pollution problem worldwide would be solved.

A:plants. B:planted. C:had planted. D:will plant.

cau3:If our teacher were here now,he us with this difficult exercise.

A:has helped. B:helps. C:will help. D:would help.

cau4:If anyone ,please tell them I'm not at work today.

A:will call. B:should call. C:called. D:calls.

cau5:If you an important decision,you will think carefully.

A:work. B:make. C:expect. D:do.

cau6:You'll get pneumonia you your wet clothes.

A:should-not change. B:don't-change. C:were-not to change. D:had you not changed.

cau7::she able to walk faster If her shoes didn't have such high heels.

A:could be. B:couldn't be. C:were. D:had been.

cau8:I things on the installment system if I were you.

A:wouldn't buy. B:don't buy. C:won't buy. D: wouldn't have bought.

cau9:If anyone attacks me, my dear dog at his throat.

A:would bite. B:will bite. C:bit. D:had bitten.

cau10:I'll pay you double if you the work finished by friday.

A:get. B:got. C: had got. D:are getting.

cau11:had I know that you were in hospital,I you. A:would visit. B:will visit. C:would have visited. D: visit.

cau12:you won't make better progress unless you class regulary. A:attend. B:attended. C:don't attend. D:didn't attend.

cau13:If you ten minutes earlier,you would have a seat in the auditorium. A:arrive. B:arrived. C:had arived. D:arrives.

cau14:If he hard,he the coming exam.

A:stidied/would pass. B:doesn't study/ will surely pass.

C:studies/can pass. D:hadn't studied/wouldn't have passed.

cau15:If she asked you for hep, ?

A:would you accept. B:you accept. C:will you accept. D:do you accept.