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to swim; swimming swimming; swimming to swim; to swim swimming; to swim
to swim swim swimming to swim in
is swimming swims swim to swim
How long How soon How old How often
Thats, swim It, to swim This, swimming Its, to swim
does; swim is; swimming does; swims do; swims
swimming ; going swimming ; go to swim ; to go swim ; going
is swim is swimming is swiming swims
swimming; goes swim; goes swims; going swimming; going
swim swimming swimming swimming swimming swim swim swim
How long How soon How old How often
Is，swim Is，swimming Does，swim Does，swimming
swimming; to swim swim; to swim swimming; swimming to swim; swimming
swam swimmed swims was swim
to swim across to swim cross swim across swim cross
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