加宾语或反身代词形式
by you 释义 :由你负责
如:
Nobody will be deceived by you.没有谁会上你的当。
We are always stand by you.我们一直在你身边。
He stands by you through all your ups and downs.他陪在你身边经历所有的起起落落
by youself:你（们)自己
例句:
I said: No， you are big now， you should sleep all by youself.我说：不陪了，你现在都这么大了，你应该自己睡了。
You have to go by youself.看起来，你不得不自己去了。
by用于被动语态的句子中:
He was praised by the teacher.他受到了老师的表扬。
The book was written by Xiaoming.这本书是小明写的。
by后面也可以接人称代词
例句：
I learn English by myself.我自学英语。
You must finish the homework all by yourself
