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Ex 11:

1. If we don't protect the environment, we will destroy ourselves.

2. If she isn't more hrd-working, she will get low mrks.

3. If he doesn't listen to his prents, he will fail.

4. They have watched the movie for one hour.

5. He has not cried for ten years.

6. He has never gone abroad before.

7. He has driven for 1 month.

8. We have eaten since it started to rain.

9. Nam is interested in wtching television.

10. I have never talked to the foreigner before.

1, If we protect the environment, we won't destroy ourselves.

2, If she is more hard-working, she won't get low marks.

3, If he listens to his parents, he won't fail.

4, They have watched the movie for one hour.

5, She has driven for 10 years

6, He hasn't gone abroad before

7, She has driven for 1 month

8, We have eaten since it started to rain

9, Nam is interested in watching television

10, I have never talked to the foreigner before