to say that somebody has the ability to do something in the present or future - can/can't, to say that somebody had the general ability to do something in the past. - could/couldn't, to say that somebody had the ability to do something in a specific situation, - was able to, to say that something is necessary or obligatory - must / have to / need to, to say that something is not necessary - don’t have to / don’t need to , to say that something is prohibited or forbidden - mustn’t, to say that something is a good or bad idea - should/ shouldn't,

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