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

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doyourhomeworkbyyourself为啥用by啊望讲解,doyourhomeworkbyyourself为啥用by啊望讲解,doyourhomeworkbyyourself为啥用by啊望讲

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!