We use must / mustn’t to talk about past necessity., Correct, Incorrect, We use should have + past participle to express regret or criticism about the past., Correct, Incorrect, We use needn’t have + past participle to say an action was done but not necessary., Correct, Incorrect, The modal verb must is not used in the past., Correct, Incorrect, We use had to / didn’t have to to talk about present necessity., Correct, Incorrect, We use didn’t need to + infinitive to say an action was done but not necessary., Correct, Incorrect, We use had better / had better not to give advice., Correct, Incorrect, We use should / shouldn’t and ought to / oughtn’t to to give advice., Correct, Incorrect, We use need to / needn’t to express necessity or lack of necessity., Correct, Incorrect, The structure had better is not used in the past., Correct, Incorrect

Modal verbs (rules)

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