1. If I (know) _____had known______ that you were ill, I (go) _____would have gone_____ to see you.

2. If she'd had some money, she (buy)____would have bought_____ to see you.

3. I (buy)__will___ a car If you lend me some money.

4. I (see) ___would have seen____ him if I (go) ____had gone____ to the party last night.

5. We could have gone out if the weather (not be) ______hadn't been______ so bad.

6. If the book (not be) ____is not_____ expensive, I'll buy it.

7. You would be surprised if he (return)________returned_______.

8. I'll go out if it (not rain) _______doesn't rain_______.

9. They wouldn't come to the party if you (not invite) _____didn't invite_____ them.

10. What __would__ you (do) ____do____ if you (be) __were__ him?

11. If that hat costs much, I (buy) ___will buy___ a small one.

12. If you (drive) _____drove____ more carefully, you (not, have) _______wouldn't have_______ so many accidents.

13. If I (make) _____make____ that mistake again, my teacher (be) ___will be___ angry with me.

14. If I spoke English, my job (be) ___would be___ a lot easier.

15. If he (go) __had gone___ to London yesterday, he (meet) __would have met__ his old friend.

16. If I (be) _____were____ in your place, I (accept) ____would accept____ Mr. Anderson' s invitation.

17. If I (win) ____won____ a big prize in the lottery, I 'd give up my job.

18. If I (be) ____were_____ you, I (tell) _____would tell____ the truth.

19. I was busy. If I (have) _____had had_____ free time, I (go) ___would have gone___ to the cinema with you.

20. - Why didn't you attend the meeting?

- Oh, I did not know! If I (know) ____had known_____ I (come) ___would have come___ there.

1. If I (know) _____had known______ that you were ill, I (go) _____would have gone_____ to see you.

2. If she'd had some money, she (buy)____would have bought_____ to see you.

3. I (buy)__will___ a car If you lend me some money.

4. I (see) ___would have seen____ him if I (go) ____had gone____ to the party last night.

5. We could have gone out if the weather (not be) ______hadn't been______ so bad.

6. If the book (not be) ____is not_____ expensive, I'll buy it.

7. You would be surprised if he (return)________returned_______.

8. I'll go out if it (not rain) _______doesn't rain_______.

9. They wouldn't come to the party if you (not invite) _____didn't invite_____ them.

10. What __would__ you (do) ____do____ if you (be) __were__ him?

11. If that hat costs much, I (buy) ___will buy___ a small one.

12. If you (drive) _____drove____ more carefully, you (not, have) _______wouldn't have_______ so many accidents.

13. If I (make) _____make____ that mistake again, my teacher (be) ___will be___ angry with me.

14. If I spoke English, my job (be) ___would be___ a lot easier.

15. If he (go) __had gone___ to London yesterday, he (meet) __would have met__ his old friend.

16. If I (be) _____were____ in your place, I (accept) ____would accept____ Mr. Anderson' s invitation.

17. If I (win) ____won____ a big prize in the lottery, I 'd give up my job.

18. If I (be) ____were_____ you, I (tell) _____would tell____ the truth.

19. I was busy. If I (have) _____had had_____ free time, I (go) ___would have gone___ to the cinema with you.

20. - Why didn't you attend the meeting?

- Oh, I did not know! If I (know) ____had known_____ I (come) ___would have come___ there.

1. If I (know) had known that you were ill, I (go) would have gone to see you.
2. If she'd had enough money, she (buy) would have bought a car.
3. I (buy) will buy a car If you lend me some money.
4. I (see) would have seen him if I (go) had gone to the party last night.
5. We could have gone out if the weather (not be) hadn't been so bad.
6. If the book (not be) isn't expensive, I'll buy it.
7. You would be very surprised if he (return) returned .
8. I'll go out if it (not rain) doesn't rain .
9. They wouldn't come to the party if you (not invite) didn't invite them.
10. What would you (do) do if you (be) were him?
11. If that hat costs much, I (buy) will buy a small one.
12. If you (drive) had driven more carefully, you (have) wouldn't have had so much accidents.
13. If I (make) make that mistake again, my teacher (get) will get angry with me.
14. If I (spoke) spoke English, my job (be) would be a lot easier.
15. If he (go) had gone to London yesterday, he (meet) would have met his old friend.

1,Known,going to see

2,will bought 

3.will buy

4.will saw,going 

5,won't be 

1. The photograph would have been much better if it (be) had been lighter in the room

2. He (die) would have dead if the surgeon hadn't operated on him

3. Please don't disturb him if he (be) is busy

4. If ice (be) were heavier than water, it wouldn't float

5. If you had strained your ears, you (hear) would have heard a slight noise in the bushes

6. If you had done as i talk you, you (succeed) would have succeeded

7. If i followed his advice, i (be) would be a fool

8. If i (lose) lose my license, i shall lose by job

9. If he had gotten one more mark, he (pass) would have passed the exam

10. If i make a promise, i (keep) will keep it

 1.If polar icecaps were melted, huge landmasses would be underwater

1, If people do not stop dumping waste into rivers, the pollution will increase.

2,If the polar ice caps melt , huge landmasses will be under water.

3, If the air in city is polluted, it can cause peole's respiratory problems.

4,If smog is frequently formed in the city, it will cause dificulty in breathing, headache and even lung cancer,

5, If carbon monoxide concentrates in great amounts , it will be harmful.

6, The climate will change if more trees are cut down for hardwood.

7, If we do not control the pollution soon , it will be too late.

8, If we do not protect the frontier, we will suffer from many natural disasters.

Công thức:  P = d.h

Trong đó:

p là áp suất (Pa - N/m²)

d là trọng lượng riêng (N/m³)

h là độ cao chất lỏng (m)

Công thức:  P = d.h

Trong đó:

p là áp suất (Pa - N/m²)

d là trọng lượng riêng (N/m³)

h là độ cao chất lỏng (m)

Công thức:  P = d.h

Trong đó:

p là áp suất (Pa - N/m²)

d là trọng lượng riêng (N/m³)

h là độ cao chất lỏng (m)