I didn't know you were so busy这是个that引导的宾语从句.我们知道,在宾语从句中如果主句的谓语动词用一般过去时,那么宾语从句的谓语动词就要用过去时的某种形式.所以宾语从句部分的谓语动词要用过去时.
didn't know you were so busy.
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I didn't know you were so busy一般疑问句
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