mustn't + Inf, Prohibition, may + Inf., Doubt. ask for permission-polite. More probability than might, might/may +have+P, Doubt. possible but not certain. Past, couldn't + Inf, Impossible. General. Ask permission-polite, don't have to +Inf, Lack of obligation. Present, have to+Inf, Obligation (other people, particular rule, circumstances, had to + Inf, Past obligation. Past of must, didn't have to+ Inf, Lack of obligation. Past, should+ Inf, It's a good idea. Advice, shouldn't + Ìnf, It's a bad idea. Advice, should have +P, You didn't, but it was a good idea. Regret, shouldn't have +P, You did, but it was a bad idea., must have +P, Sure/almost sure. EVIDENCE, can't have +P, Impossible. Opossite of Must have (+), needn't have +P, You did, but it wasn't necessary, didn't need to +Inf, It wasn't necessary. Past, don't need to/needn't+ Inf, It isn't necessary. Present, must+Inf, Obligation (general law, subject )/ Certain (evidence), could+have+P, You could, but you didn't do. Depend on the subject decision, couldn't have+p, Impossible, even if you wanted. Past, was/were able to + Inf., Particular or special situation/skill. Past, be (-) allowed to+ Inf, NOT permitted. , be (+) allowed t+ Inf, Permitted, Would have + P, Didn't happend. Depend on other people/circumstances, can+Inf, 100% Possible. Hability/ Permission-informal, be able to+ Inf, = can. Capable of. 100% Hability/Possibility, can't+ Inf, Impossible. Unbelief. Present, might + Inf.  , Doubt. Ask for Permission more formal. Less probability than may, may/might+Inf. , Doubt. maybe, perhaps, not sure. Ask for permission.

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