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, 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.,

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