swim是动词，而swimming则是名词，表示游泳这项运动。
e.g.
I
usually
swim
a
few
laps
as
warm-up
during
practices.---我一般都会在训练中先游几圈作为热身。
My
hobbies
are
painting
and
swimming.---我的兴趣是画画和游泳。
注：swim的现在进行时同样是swimming，不要把它和作为名词的swimming搞混了。
e.g.
He
is
swimming
right
now.---她现在在游泳。
swim
和
swimming
两者作为[名词]是的分别是
swimming
:
[不可数名词]
游泳（运动）
Swimming
is
great
exercise.
游泳是项很好的锻炼
swim
:
[可数名词]
游泳
Let's
go
for
a
swim.
咱们游泳去吧。
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