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Certainty or Possibility
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It can’t / mustn’t / might be John over there; he’s already moved to Canada
can't
Oops!
Okay!
He can’t / mustn’t / didn’t have been to Moscow, because he doesn’t have a Russian visa in his passport
can't
Oops!
Okay!
You must / might / may be tired – you haven’t been to bed for two days!
must be
Oops!
Okay!
He’s just been successful in getting a place on a postgraduate course, so he might / could / must be very academic.
must
Oops!
Okay!
She must / will / may have revised very well, because her exam results were outstanding.
must
Oops!
Okay!
I was amazed by her performance. She couldn’t / can’t / mustn’t have spoken more convincingly in the debate
couldn't
Oops!
Okay!
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