You decide by yourself =you decide for yourself吗?

You decide by yourself =you decide for yourself吗?
You decide by yourself =you decide for yourself吗?

You decide by yourself =you decide for yourself吗?
不一样
一个是自己做决定
一个是为自己决定

NO NO NO!!!
you decide by yourself 是你自己决定
you decide for yourself 是你为你自己决定

一样