what time does she run 为什么不加s

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what time does she run 为什么不加s
what time does she run 为什么不加s

what time does she run 为什么不加s
因为句子里的动词 run 是实意动词,因此在变否定句和疑问句时,要在句子里加“助动词”,一旦使用了助动词,其后的动词就要恢复原形.

因为已经有了助动词does 了，所以后面的run 应该用 动词原形

因为DOES加了第三人称单数,所以后面的run不加s

第三人称单数

疑问动词后面都用原型

问句或否定句的第三人称单数体现在助动词does上，动词用原形
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