->.......You needn't go home early.......................................................................

4. I wonder why Tom didn't phone me (he must/forget)

->.......He mustn't forget phone you.......................................................................

5. You've sihned the contract. (it/can't/change/now)

->...............It can't change the contract now..............................................................

6. What's Linda doing? I'm not sure (she may/watch/television)

->..................She may watch television now...........................................................

7. Ann was standing outside the cinema. (she must/wait/for somebody)
..........She must wait for somebody........................................................................