I'll question him about what he was doing yesterday为什么不能说I'll question him about what he did do yesterday?

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I'll question him about what he was doing yesterday为什么不能说I'll question him about what he did do yesterday?

I'll question him about what he was doing yesterday为什么不能说I'll question him about what he did do yesterday?
I'll question him about what he was doing yesterday
为什么不能说I'll question him about what he did do yesterday?

I'll question him about what he was doing yesterday为什么不能说I'll question him about what he did do yesterday?
应该:I'll question him about what he did yesterday?

宾语从句的谓语,正常语序中无需再加助动词.

因为宾语从句的语序是陈述句的语序,既然是陈述句的语序,就不能用助动词,表现过去时时就把动词变成过去式就可以了,希望我能帮助你解疑释惑。

可以说what he did.
这个涉及的是基本的时态运用啦.

时态不同,
第一句是想问当时在做什么
第二句是问 昨天都干了什么