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mustn’t shouldn’t can’t needn’t
listen listens listening to listen
tell, is telling tells, is telling told, was telling tell, will telling
to do not to do don’t do do
asking to ask being asked to be asked
don’t swim not swim not to swim swim
asking to ask being asked to be asked
asking to ask being asked to be asked
not to waste not waste don’t waste wasting
asking to ask being asked to be asked
not to play not to play with to play to play with
to study study not to study studying
speak spoke to speak speaking
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