He never did anything but watch TV. did之后动词为什么用原形?

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He never did anything but watch TV. did之后动词为什么用原形?

He never did anything but watch TV. did之后动词为什么用原形?
He never did anything but watch TV. did之后动词为什么用原形?

He never did anything but watch TV. did之后动词为什么用原形?
did的原型是do,是一个助动词,did只是因时态所需才用过去式,本身性质就是一个助动词,其后面跟的就跟do后面跟的一样的

因为did的原型是do。do是助动词,它的形态要根据时态的改变而改变。do的过去式是did,所以后面的时态就不用改变了。

确定句子正确吗?按理说应该是watched

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