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Modals A1

1 You __________ have posted my letters for me while you were at the post office.
didn’t
mustn’t
can
might

2 It __________ have been a good idea to ask her before you just jumped in and did it.
should
could
might
may

3 I can’t imagine what you __________ to do something so stupidly dangerous.
could have been thinking
mightn’t have been thinking
can have thought
couldn’t have thought

4 I __________ say this much for him; he’s very generous.
might
could
may
will

5 He __________ , though I warned him not to.
must go
can have gone
would go
would have gone

6 He __________ it; he was with me at the time.
can’t have done
can’t do
won’t do
mightn’t have done

7 You __________ told them that! I asked you to keep quiet.
wouldn’t
mustn’t have
shouldn’t have
mightn’t have

8 Well, you __________ have sold him the car if you didn’t think he would pay enough.
can’t
needn’t
may not
mustn’t

9 You __________ have helped me a little more – you weren’t doing much.
may
could
must
can

10 __________ you have left the keys in the car?
Needn’t
Must
May
Could