为什么要用不定式?When you don't know a word,the best way is to look

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为什么要用不定式?
When you don't know a word,the best way is to look it up in a dictionary.
这里the best way is 后面为什么要用to?

首先我们分析一下句子结构When you don't know a word引导时间状语,the best way 做主语 is是系动词
所以后面应该接个表语因为动词不可以做表语所以我们在这引进非谓语动词,不定式就是其中的一种.
下面我们就来讨论为什么要用to do
动词不定式作表语时,表示一个具体动作或未发生的动作 ,结合句子 look it up in a dictionary(查字典)是When you don't know a word(当你不知道一个词语)之后所发生的,换句话说在你不知道一个词语的时候,查字典这个动作还没有发生所以这里要用不定式

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