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was和did的区别（详细）做题时就发现did

2020-05-02 教育 314阅读
was 是系动词，后跟形容词＼名词＼副词，作为助动词时后跟动词ing或动词的过去分词。
如：
He was a student ten years ago.
He was doing his homework at nine last night .
did是行为动词或助动词
He did his homework just now.
Did he do his homework just now ?
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