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