be 是 is am are

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be 是 is am are
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be 是 is am are
be 是 is am are

be 是 is am are
是,这个叫be动词,意思和用法很多,一般的意思是:是,此种用法,有多种变化形式:is,am,are,was,were,being,been,to be

是的

be是 am is are. was were been的原形

是,也是was/were/been的原型。be常用语讲解语法结构时代替以上几个不同时态的变形。

yes