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I needn't have/shouldn't have gone out last night as I had so much work to do
shouldn't have
You might have/needed to have rung me to say you'd missed the bus - I was worried sick
might have
Animals can be kept in zoos, but they must to have a comfortable place to live.
Animals can be kept in zoos, but they must have a comfortable place to live.
You mustn't have been here last summer - the cafe only opened a month ago.
You can't have been here last summer...
Need/ought I have let someone know about this earlier?
Ought I
You didn't spend enough time on this project. You ought...hours on this project. (PUT)
You ought to have put in more hours on this project.
You should have spilled the beans about Lisa before now. If only you could...secret before now. (let)
If only you could have let me in on Lisa's secret before now.
I'm sure I don't have to/mustn't remind you of the need for confidentiality.
don't have to
I've written a few notes about things that may be changed if the campaign is to succeed.
I've written a few notes about things that must/should be changed if the campaign is to succeed.
You.....(not stay) so late last night to finish the report. You could have done it this morning.
needn't have stayed/ didn't have to stay
Judging by her expression, I'd say he....(tell) her the good news already.
must have told
I.....(leave) my keys in the office because I remember having them with me on the way home.
can't have left
Strange as it ......(seem), Mozart's music..........(have) a profound effect on the brain.
may/can
It's not really polite of him. He...(let) them know he was going to be late.
should have let
Survivors felt there .....(be) an investigation last year into the cause of the disaster.
should have been
His dog ought to be registered because then they would have been able to trace it.
His dog ought to have been registered because then they would have been able to trace it.
