asking for permission, May I take this?, impossibility, He can't have finished the test., possibility, She might be staying at this hotel., strong probability, deduction, We must already have the bill on our mail., permission, You can join us later if you are busy, advice, He shouldn't give in so fast., obligation, I have to say this although it's not very pleasant., absence of necessity, You needn't go there if you don't want to., prohibition, You mustn't go there alone!, responsibility, duty, They are to be at work at 8 am tomorrow., criticism, He shouldn't have given in so fast..

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