mustn't+ inf, It's illegal. Prohibition, could+ inf. PAST, It was possible. General Ability/situation. Polite request/permission., couldn't+ inf. PAST, It wasn't possible. Impossible in the Past., don't have to inf, It's not obligatory, have to inf, It's an obligation(particular rules, other people, circumstances), had to inf, Past obligation (have to, must)., didn't have to inf, It wasn't obligatory. Lack of obligation in the past, should+ inf, It's a good idea. Advice, shouldn't+inf, It's a bad idea. Advice, didn't need to inf, It wasn't necessary in the past., don't need to inf, needn't inf, It isn't necessary. Lack of necessity., may+inf, Maybe, perhaps. Doubt. Permission (formal), hopes, desires. + probability, might+inf, it's possible. Maybe, perhaps. Very formal (low probability), could/may/might+ inf, Suggestions/permission/ hability/possibility., was o were able to inf, Specific hability/situation. Difficulty, great effort, luck, climatology.., be allowed to inf, be allowed to instead of can to express permission or possibility, must+ inf, Obligation (general law, own subject). Centainty, evidence., can't + inf, am not/isn't/aren't able to inf, Impossibility in the present. Unbelief. Unskilled., can, am/is/am able to inf., 100%. Ability, possibility, informal permission/request in the present., shall+ i nf, to make offers and suggestions, and to ask for advice. Interrogative, need to, It's necessary. It's important to do it.

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