现在进行时、一般现在时、一般将来时、一般过去时的 用法 动词构成 标志词
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也就是be动词，即系动词的五种变化。
现在进行时为
i
am
doing
he、she
is
doing
they
are
doing
过去进行时
i
、he
，she
was
doing
they
were
doing
现在进行时为
i
am
doing
he、she
is
doing
they
are
doing
过去进行时
i
、he
，she
was
doing
they
were
doing
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