Eva shouldn't have / didn't need to put on a party two days before New Year's Eve. Almost no one came.
shouldn't have
Why did I bother buying a big bottle of water? Samuel had already packed one. I didn't need to bother / shouldn't have bothered.
shouldn't have bothered
You need / must make more of an effort in class.
must
You don't have to / mustn't stand on the desk. Otherwise, you'll break it.
mustn't
You mustn't / needn't look at other students' work. It's against the rules.
mustn't
I think her book would / should have sold millions but the publishers thought it wasn't enough.
would
You ought not to / don't have to eat so many sweets. They aren't good for you.
ought not to
'But it was an accident!' 'Well, you should / would have been more careful.'
should
I worked fast and finished my essay on time but now the teacher has given the class 2 more weeks.
I ............... so hard. NEED
needn't have worked
We didn't bother dressing up smartly because it wasn't necessary. It was a casual party.
We .................dressing up smartly because it was a casual party. NOT
did not need to bother
I think she's wrong to make promises which she doesn't keep.
She .......... promises which she doesn't keep.
shouldn't make
I bought a ticket but it wasn't necessary - I made a mistake.
I ..................a ticket. HAVE
needn't / shouldn't have bought
'Why did you worry about me? I didn't take any risks.''You ......... injured' COULD
could have been/got
It was a mistake for you to buy a dog.
You ........ a dog. BOUGHT
shouldn't have
You can give the tour guide a tip but it's not necessary.
You ..............give the tour guide a tip.
don't need to / needn't
I'm tired. I have to / must go to bed early.
must
