請問I Didn't know是何時會用到的呢?我不太清楚

請問I didn\'t know是何時會用到,因為did是do的過去式,我不知道通常一般不是說I don\'t know嗎?那你何時會回答I didn\'t know呢?在回答什麼問題下或是情況下你會用I didn\'t know?
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