rewrite sentences:
1. unless we protect the environment, we will destroy ourselves.
If...............................................................................................
2. unless she is more hard-wolking, she will get low marks.
if............................................................................................
3. unless he listens to his parents, he will fail.
if...........................................................................................
4. they begen wathching the movie one hour ago.
they have...............................................................................
5. he last cried 10 years old ago.
he has.............................................................................
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.
