be动词的形式和用法
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1、Be动词的形式： be, is, am, are, was, were, being, been。
2、be动词的用法：后面接名词，形容词，地点副词，或短语做补足语。
3、be动词的否定，在am, is, are, was, were 后面加 not, 缩略式am not, isn't, aren't, wasn't, weren't。
1、Be动词的形式： be, is, am, are, was, were, being, been。
2、be动词的用法：后面接名词，形容词，地点副词，或短语做补足语。
3、be动词的否定，在am, is, are, was, were 后面加 not, 缩略式am not, isn't, aren't, wasn't, weren't。