UC知道which books did you by ？
来源：百度知道 编辑：UC知道 时间：2024/06/28 16:09:59
为什么用did 不用were
是buy吧。。。
因为有了动词buy,所以提问用did,如果用is句子中就出现了两个动词（is,buy）
因为buy（购买）是谓语动词，不用再用系动词are(were).
原句是I bought the books.
buy是行为动词，因此要用do。
如果是形容词，才用be。
买写错了.by应改为buy.buy是动词,但句子中不能同时有两个动词啊~所以要用到助动词did,而不是be动词were.
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