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mustn’t ; must needn’t ; must can’t ; must needn’t ; may
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finish finishing finished to finish
put off put away put down put up
to spend；writing spending；writing spending；to write to spend；to write
couldn’t; may can’t; can needn’t; can may not; must
needn't mustn't shouldn't don't have to
to become becoming becomes became
puts up builds up sets up turns up
when you finish your work when you finished your work when do you finish your work when did you finish your work
Do, finish Are, finishing Did, finish Have, finished
you are allowed to watch are you allowed watching are you allowed to watch can you be able to watch
finishes is finished was finished will finish
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