Rewrite sentence

1.Unless we protect the environment, we will destroy ourselves.

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

2,Unless she is more hard-working, she will get low marks

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

3,unless he listens to his parents, he will fail.

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

4,they began watching the movie one hour ago.

They have . .watched the movie for one hour.......

5,he last cried ten years ago.

He has.. not cried for ten years......

1.Unless we protect the environment, we will destroy ourselves.

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

2,Unless she is more hard-working, she will get low marks

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

3,unless he listens to his parents, he will fail.

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

4,they began watching the movie one hour ago.

They have . .watched the movie for one hour.......

5,he last cried ten years ago.

He has.. not cried for ten years......

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

2.2. If she is more hardworking, she won't get low marks.

3.3. If he doén't listen to his parents, he will fail.

4.4. They have watched the movie for one hour.

5.5. He hasn't cried for 10 years.