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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