My problem is _ (not know) where to go.
问题描述：
My problem is _ (not know) where to go.
答
not knowing
动名词做表语
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答
My problem is not knowning where to go.
我的问题是不知道去哪里。
答
My problem is not knowing (not know) where to go.
我的问题是不知道去哪里.
主系表结构,My problem 是主语, is是谓语,not knowing动名词作表语.