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I'm sure he is at home.
He must be at home.
It's impossible that he knew the problem. (can)
He can't have known the problem.
We have bought more food than was necessary for the party.
We needn't have bought so much food
I'm sure they didn't phone you. (can)
They can't have phoned you.
It's just possible that he went to bed early.
He might have gone to bed early.
If I were you, I'd tell the truth.
You should tell the truth
It is obligatory for you to wear a uniform.
You have to wear a uniform.
It is not necessary for them to cook lunch.
They don't have to cook lunch
It was careless of him to go without checking the time
He should have checked the time before going.
