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to swim; swimming swimming; swimming to swim; to swim swimming; to swim
A. to swim swiming to walk walking
often always usually seldom
to swim; to swim swimming; swimming to swim; swimming swimming; to swim
to swim; to swim swimming; swimming to swim; swimming swimming; to swim
swim; swim swim; swimming swimming; swimming swimming; swim
to swim swim from swimming swimming
will swim Have swum swam swims
to swim; to swim swimming; swimming to swim; swimming swimming; to swim
don’t swim not swim not to swim swim
how will it learn will it learn how it will learn how and it learns how
Is，swim Is，swimming Does，swim Does，swimming
was able to swim able to swim was swimming can’t swim
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