be有几种形式

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be有几种形式

一般现在时:am ,is ,are
一般过去时:was ,were
完成时:been

主格am, 宾格is, 复数are三种吧
如果是时态就多了

am, is, are

am: I am a person.
is: He is right.
are: You are beautiful.
was: I/He/She/It was there that monemt.
were: We were happy.
(have/has/had) been: I have been in Sinapore.
being: Being with you, I feel happy.

am
is
are
been
was
were

一般现在时:am ,is ,are
一般过去时:was ,were
完成时:been

is am are
was were
being
(have/has/had)been