which books did you by 为什么用did 不用were

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which books did you by 为什么用did 不用were
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which books did you by 为什么用did 不用were
which books did you by
为什么用did 不用were

which books did you by 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.