dave went through his pockes looking for the keys.为什么不是to lo

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dave went through his pockes looking for the keys.为什么不是to look?这句话中不是有两个谓语动词吗?

1.这个句子中并没有两个“谓语动词”,只有一个：went.looking是“非谓语动词”.
2.非谓语动词有三种形式：不定式,-ing 动词和过去分词.他们在句子中不充当谓语,所以称“非谓语动词”.
3.以本句为例,句子有了谓语动词went,那么后面只能用非谓语动词了.-ing形式和不定式都可以用,但是意思和结构不一样的.
a.looking 是现在分词,做状语,表示伴随状况,即：手伸进口袋的同时在寻找.
b.to look动词不定式,做状语,表示目的.即：手伸进口袋的目的是为了寻找.
4.但如果句子改一下,变成两个句子,就可以用谓语动词形式了.
dave went through his pockes and he was looking for the keys.
或者As dave went through his pockes he was looking for the keys.
请注意谓语动词和非谓语动词的不同形式.

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