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don't swim to not swim not swimming not to swim
trained warned led encouraged
mustn't; dare not do may ; dare not do can; dare to do needn't; dare do
can’t may not mustn’t needn’t
swim swimming swims to swim
between through across over
Must, can't Can, may not Shall, don't May, mustn't
to step of stepping to fall of falling
mustn’t; dare not do may; dare not do can; dare to do needn't; dare do
mustn't; dare not do may ; dare not do can; dare to do needn't; dare do
mustn't; dare not do may ; dare not do can; dare to do needn't; dare do
mustn’t may not can’t needn’t
mustn’t may not can’t needn
mustn’t may not can’t needn’t
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