Share Degrees of certainty
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He didn't answer the phone. He CAN'T HAVE BEEN \ MUST HAVE BEEN SLEEPING sleeping.
must have been
The road is wet. It can't have been raining\must be raining\must have been raining.
must have been raining
You can't be hungry\must be hungry\ should be hungry. You've only just had lunch.
can't be
Her new car looks expensive. It must hace cost\ mus cost\ can't have cost a fortune.
must have cost
They might\can't\should have gone home. I don't see him anywhere.
Surely he mustn't\can't still be alive after all this time.
can't
Our car broke down and we couldn't \ may not have enough money to pay for the repairs.
may not
Many accidents could\ must\ can be prevented with a little care.
could
She couldn't \ might not want to come with us.
might not
Mr. Morris must \ can't be nearly years old but he doesn't look it.
can't be
I don't know where Bernard is - he must\could be playing tennis with Carrie.
could
They're going whitewater rafting. They have to\ may be mad to do such a thing!
have to be
You have to\ should be joking. He can't have \ might not have passed away. I saw him on TV just now.
have to, can't
She is down in the dumps. She MUST \ CAN'T \ MAY have broken up with her partner.
must
