You ought not to / don't have to eat so many sweets. They aren't good for you.
ought not to
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
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
You wouldn't / needn't have washed those socks. I'm throwing them away.
needn't
It was wrong of them to use the machine without asking for permission first.
They .......... permission before using the machine. SHOULD
should have asked for
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
You need / must make more of an effort in class.
must
I needn't have gone / didn't have to go to the talk. It didn't tell me anything I didn't already know.
needn't have gone
It was a mistake for you to buy a dog.
You ........ a dog. BOUGHT
shouldn't have
I needn't have worn / didn't have to wear a hat to the ceremony, but I did because I had just bought a new one.
didn't have to wear
I told you this would happen. You should listen / have listened to me in the first place!
have listened
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
You should buy / have bought a better telescope with the money you'll get on your birthday. This one isn't very good.
buy
The company doesn't have to / mustn't do any more trials on the vaccine because it has been declared safe.
doesn't have to
You needn't get / needn't have got a new screen; the old one was perfectly adequate.
needn't have got
I think her book would / should have sold millions but the publishers thought it wasn't enough.
would
I think she's wrong to make promises which she doesn't keep.
She .......... promises which she doesn't keep.
shouldn't make
'But it was an accident!' 'Well, you should / would have been more careful.'
should
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
I'm tired. I have to / must go to bed early.
must
You mustn't / needn't look at other students' work. It's against the rules.
mustn't
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
You don't have to / mustn't stand on the desk. Otherwise, you'll break it.
mustn't