what were you doing yesterday?等于what what did you do yesterday?

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whatwereyoudoingyesterday?等于whatwhatdidyoudoyesterday?whatwereyoudoingyesterday?等于whatwhatdidyoudoye

what were you doing yesterday?等于what what did you do yesterday?
what were you doing yesterday?等于what what did you do yesterday?

what were you doing yesterday?等于what what did you do yesterday?
不等于!
what were you doing yesterday?
意思是:你昨天正在干什么?
强调过去正在进行的动作.
what did you do yesterday?
意思是:你昨天干了说明?
只是强调过去的动作.

what were you doing yesterday?是病句,有动词了就不能 were 了
只能是what did you do yesterday?

你昨天正在干什么?主语+be动词过去was/were+doing
你昨天干了什么?主语+动词过去式