请问这句话中的watch为什么要加ing?he fall asleep while watching televisio

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/22 10:52:14

请问这句话中的watch为什么要加ing?he fall asleep while watching television.

fall不对,应该用过去式fell.
He fell asleep while watching television.一句中在while和watching之间省略了he was,从意义上来说,后半句应该用过去进行时,当状语从句和主句是同一个主语,且从句主语后的谓语动词是系动词（am,is,are,was,were）时,从句的主语和系动词可以省略.最常见的就是when,while后面省略主语和系动词.

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