might/could have been
the one arrested instead
of the real thief.
• The plan
might/could
easily
have gone
wrong, but in fact it was a great success.
We use
might
(not 'may')
+ infinitive
to talk about what was
typically
the case in the past:
• During the war, the police
might arrest
you for criticising the king.
• Years ago children
might be sent
down mines at the age of six. (passive form)
We can also use
could + infinitive
in examples like this to talk about past ability (see Unit 22). For
example, 'During the war, the police could arrest you...' means that the police were legally able to
arrest you.
We use
may/might
(not 'can')
+ have + past participle
to say that by some time in the future, it is
possible that something will have happened:
• By next Friday
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