I didn't know she could swim 中为什么用could

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Ididn''tknowshecouldswim中为什么用couldIdidn''tknowshecouldswim中为什么用couldIdidn''tknowshecouldswim中为什么用could因

I didn't know she could swim 中为什么用could
I didn't know she could swim 中为什么用could

I didn't know she could swim 中为什么用could
因为前面用了didn't,一句话中的语态要一致