3. Complete the sentences. Use mustn’t or needn’t + one of these verbs:
clean, forget, hurry, lose, wait, write
1) The windows aren’t very dirty. You _____ them.
2) We have a lot of time. We _____ .
3) Keep these documents in a safe place. You _____ them.
4) I’m not ready yet but you ____ for me. You can go now and I’ll come later.
5) We _____ to turn off the lights before we leave.
6) I _____ the letter now, I can do it tomorrow.

1) The windows aren’t very dirty. You needn’t clean them. 2) We have a lot of time. We needn’t hurry. 3) Keep these documents in a safe place. You mustn’t lose them. 4) I’m not ready yet but you needn’t wait for me. You can go now and I’ll come later. 5) We mustn’t forget to turn off the lights before we leave. 6) I needn’t write the letter now, I can do it tomorrow.

1, needn't clean.2. needn't hurry.3. mustn't lose.4. needn't wait.5. mustn't forget.6. needn't write.