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Unit 28. Must and can't
(использование оборотов must и can't)

Study this example:
 
Unit 28. Must and can't

We use must to say that we feel sure something is true: We use can't to say that we feel sure something is not possible: Study the structure:
 
I/ you/ he (etc.) must
can't
be (tired / hungry / at work etc.)
be (doing / coming /joking etc.)
do / go / know / have etc.

For the past we use must have (done) and can't have (done). Study this example:
 
Unit 28. Must and can't George is outside his friends' house.
He has rung the doorbell three times but nobody has answered.
 
They must have gone out. (otherwise they would have answered)
Study the structure:
 
I/ you/ he (etc.) must
can't
have been (asleep / at work etc.)
been (doing / working etc.)
done / gone / known / had etc.

Couldn't have… is possible instead of can't have…: See Unit 26. Can't ('I can't swim' etc.)
(использование оборотов can, could, (be) able to).
See Unit 31. Must ('I must go' etc.)
(использование оборотов must и have to).
See Unit 32. Must ('I must go' etc.)
(использование оборотов must, mustn't и needn't).
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