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