I. Complete the second sentence so that it has a similar meaning to the first.

1. You aren't allowed to make noise in the library.

You mustn't make noise in the library.

2. It isn't necessary for you to go to school so early.

You don't have to go to school so early.

3. It is a good thing for you to keep the house clean and tidy.

You ought to keep the house clean and tidy.

4. I had a good time at the party last night.

I enjoyed the party last night.

5. Must he leave now?

Does he have to leave now?

6. Playing with matches is very dangerous.

It's very dangerous to play with matches

7. You must stay in bed because of your illness.

You must stay in bed because you are ill

8. It isn't necessary for you to water that tree every day.

You don't have to water that tree every day.

9. He stays up too late and he is always tired the next morning.

He should go to bed early so he won't be tired the next morning.

10. It is dangerous to put a knife into an electrical socket.

Putting a knife into an electrical socket is dangerous