do your homework by yourself 为啥用by啊 望讲解,

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do your homework by yourself 为啥用by啊 望讲解,
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do your homework by yourself 为啥用by啊 望讲解,
do your homework by yourself 为啥用by啊 望讲解,

do your homework by yourself 为啥用by啊 望讲解,
很高兴为你解答.
Do your homework by yourself
自己独立完成作业
by oneself = on one's own 靠自己,为固定搭配.
祝开心~o(∩_∩)o 哈哈~

by yourself
没有为什么,它是个固定词组,表示你自己做。。。
而且只能do sth by yourself, 把by yourself 一定放后面哦。
这种词组只有死记。

by yourself ( by oneself)是固定搭配,表示自己的意思。

不加by也是可以的,You must do your homework yourself中yourself 作状语修饰谓语,
You must do your homework by yourself 中by yourself 介词短语作状语修饰谓语,都是一回事!