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Not knowing what to do, he went to his parents for help.为何要用

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Not knowing what to do, he went to his parents for help.为何要用knowing?可以用know,known吗?
Not knowing what to do, he went to his parents for help.为何要用
不可以,Not knowing what to do 这是独立主格.
独立主格结构（Absolute Structure）
是由名词或代词加上分词等构成的一种独立结构,用于修饰整个句子.独立主格结构中的名词或代词与其后的分词等构成逻辑上的主谓关系.这种结构与主句不发生
句法上的联系,它的位置相当灵活,可置于主句前、主句末或主句中,常由逗号将其与主句分开.需特别注意的是,独立主格结构与主句之间不能使用任何连接词.
独立主格结构基本构成形式
名词(代词)+现在分词（过去分词；形容词；副词；不定式；名词；介词短语）　
再问： 名词(代词)+现在分词（过去分词；形容词；副词；不定式；名词；介词短语） 那为何不能用过去分词？
再答： know 与he 是主动关系，而非被动，所以不用过去分词
Not knowing what to do, he went to his parents for help.为何要用 Not knowing what to do,he went to his parents for help.为什么是n Not knowing what to do,he went to his parents for help.什么意思 1.______ what to do,he went to the manager for help. 句子分析：Not knowing what to do,he decided to ask the teacher fo He went to Shanghai with his parents ------. He stood there (),not knowing what to do.A helpless B helple 英语词汇题3.He stood there ,not knowing what to do. Because he didn't know how to do it,he went to her for help. “the foolish man stood there not knowing what to do”为什么用“kno 为什么说He always tires to do what he can to help his classmates 几道英语单选 1.He stood there ____,not knowing what to do .A helpl