One who knows when to be speak will also know when to be silent.前面konws后面是know,为什么?按理说不都是第三人称单数么,主语不都是one么?

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One who knows when to be speak will also know when to be silent.前面konws后面是know,为什么?按理说不都是第三人称单数么,主语不都是one么?
One who knows when to be speak will also know when to be silent.前面konws后面是know,为什么?
按理说不都是第三人称单数么,主语不都是one么?

One who knows when to be speak will also know when to be silent.前面konws后面是know,为什么?按理说不都是第三人称单数么,主语不都是one么?
这里第一个knows的主语是who,是第三人称单数,所以是knows.
而第二个know本来也应该是knows的,因为主语是one,但是因为前面有个will,后面需要加动词原形.
所以用know而不是knows.

will后面加动词原形嘛

前面是现在时后面是将来时 will know。

前面的WHO KNOWS ……SPEAK 是定语从句修饰先行词ONE，而ONE是单数，故要用KNOWS。
第二个KNOW 用在WILL 后要用动词原形。
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who knows when to be speak作为定语从句修饰one。其中定语从句中who 代指 one.因此前面的know 的主语是one ,应该用三人称单数。后面的know 是在will 后面，will 是情态动词，后面动词用原形。

原因是，第二个know 的前面有个will，这样就注定了will的后面跟的动词就要用原形了。
who knows when to speak 是一个定语从句，who就是这个从句的主语。

亲，第二个know前面是助动词will,所以后面的动词用原型的哦~

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