助动词
起辅助作用
不能单独构成谓语
Be动词
am
is
are
was
were
be
情态动词
can
could
will
would
shall
should
may
might
must
have to
need
dare
had
better
不单独构成谓语
+do
无人称变化
有本身含义
狭义助动词
do
does
did
完成助动词
have
has
had
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