What were you doing when the UFO arrived?是个什么从句?

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/06/09 23:34:56

What were you doing when the UFO arrived?是个什么从句?
谢谢

1.when是at or during the time that, 既指时间点,也可指一段时间；
2.when 说明从句的动作和主句的动作可以是同时,也可以是先后发生；
3.由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时；如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如：
When the teacher came in, we were talking.
题中那句话就这个句型.

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