5. Put the following sentences in negative and interrogative forms:

Example: I have just finished my homework.

I haven’t finished my homework yet.

Have you finished your homework?

1. I have already posted the letters.

2. They have known Ann since September.

3. She has gone to London.

4. He has just passed his driving test.

5. I have seen this film twice.

6. We have done our work this week.

7. He has been at school for two years already.

8. She has recently got a new job.

9. They have just left.

10. We have been in Rome for three weeks now.