is are were am was 分别是什么主语的be动词

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is are were am was 分别是什么主语的be动词
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is are were am was 分别是什么主语的be动词
is are were am was 分别是什么主语的be动词

is are were am was 分别是什么主语的be动词
(he she it)is was,(we they you)are were,I am