mustn't - It's illegal, could/might/may - It's possible, could/might/may have - It was possible, couldn't - It wasn't possible, don't have to - It's not obligatory, have to/must - It's an obligation, had to - It was an obligation, didn't have to - It wasn't obligatory, should - It's a good idea, shouldn't - It's a bad idea, should have - You didn't, but it was a good idea, shouldn't have - You did, but it was a bad idea, must have - It's the only explanation for what happened, can't have - It's impossible that this happened, needn't have - You did, but it wasn't necessary, didn't need to - It wasn't necessary, don't need to/needn't - It isn't necessary,

Modal verbs

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