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helpful harmful painful careful
swimming; swimming to swim; swimming swimming; to swim to swim; swim
used to swimming used to swim use to swim use to swimming
A． stood in your way stand on the way stand in your way stand by the way
A． stood in your way stand on the way stand in your way stand by the way
swimming; swimming to swim; swimming swimming; to swim to swim; swim
stand to do stand doing stand being done stand to be doing
swim swimming to swim to swimming
mustn’t needn’t cant’t couldn’t
used to swimming used to swim use to swim use to swimming
can; must can; cant may; mustn′t must; can′t
swim; skate swimming; skating swimming; skate skate; swimming
used to swimming used to swim use to swim use to swimming
swim swimming swimming swimming swimming swim swim swim
swim , swim swimming , swim swim , swims swimming, swims
swimming ,to swim swimming , swimming to swim, swimming to swim, to swim
swimming… playing swimming…plaiing swimming… I playing swimming…plaing
swimming;swimming to swim; to swim swimming; to swim to swim; swimming
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