英语：what did you do 为啥后面的就不用变过去式了呢?

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英语：what did you do 为啥后面的就不用变过去式了呢?
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英语：what did you do 为啥后面的就不用变过去式了呢?
英语：what did you do 为啥后面的就不用变过去式了呢?

英语：what did you do 为啥后面的就不用变过去式了呢?
在 do(does/did)之后一定接动词原形.

前面的did已经表达了过去时的意思了，后面再用过去时已经显得没必要。

因为前面已经有did了，did是do的过去式嘛，所以后面就用do，感觉上就是避免重复

有助动词的只要助动词变就可以了。

因为DID是过去式。后面的动词改为原型。

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