Sorry I [didn"t] know you were sick.括号中为什么用didn"t.
问题描述：
Sorry I [didn"t] know you were sick.括号中为什么用didn"t.
答
你还可以这么想,you were sick,用were表一般过去,要否定,并前移,助动词要与were时态一致,用didn't,当然也可以考虑是我不知道你生病是发生在过去的事情.
希望能帮助你!