• Key to exercises p 158:

1 

1 couldn't have been   2 won't do   3 should have scored   4 You must be   5 may well be forced   6 You don't have to   7 should   8 needed to get   9 should have known   10 didn't need to bring   11 can appreciate   12 I'd prefer

2

Convers 1: 1 can't / isn't able to go   2 might/may/could have   3 would be   4 should / ought to take   5 can/could come

Convers 2: 1 won't accept   2 may/might/could/must be trying   3 should have read   4 can/could/might happen

Convers 3: 1 can't have forgotten   2 could she forget / have forgotten   3 had/needed to stop   4 'll/should be

Convers 4: 1 must / should / have to / need to eat   2 should/needn't have done

3

1 should (would)   2 may (could)   3 wouldn't   4 can   5 could   6 needn't (shouldn't)

4

1 should X would   2 don't have to X mustn't/shouldn't   3 must to X must   4 won't can X won't be able to / can't   5 needn't have gone X didn't need to go   6 had X have

• Extra practice on modals