i think li lei must be at school

i think li lei must be at school
为什么要用be而不是be动词？be到底有几种用法？

wangxialing 1年前已收到1个回答举报

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康尼雅幼苗

共回答了19个问题采纳率：89.5% 举报

助动词后面要用动词原形
be动词的原形就是be,
am,is,are,was,were都是它的不同形态

1年前

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