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热心网友
Be
是am
is
are的原型,当需要用原型的时候就用be。
比如所,to
be
adj.
Would/will/Can/Could/May/Might/Shall
+
Be,
其他普通情况用am
is
are。
比如He
is
a
student.
I
am
a
student
too.
We
are
students.