for oneself by oneself区别

for oneself”和“by oneself”的区别主要在于“for oneself”强调的是为了自己的利益或方便，而“by oneself”强调的是单独或独自地。

for oneself例句

One should not livefor oneselfalone.

一个人不应只是为自已活着。

At the end of the day one must decidefor oneselfabout religion.

一切都安顿好了，人们就得考虑宗教的事了。

It's hard to say, but I'm sure one of the purposes is to construct a good philosophyfor oneself.

很难说，但我确定大学生活的目标之一是要为自己建立一个好的人生观。

by oneself的用法

1.当by oneself表示“单独地，独自地”讲时，它相当于alone。

例句：One cannot play tennis by oneself.

一个人不能单独的打网球。

2.当by oneself表示“靠自己，无他人帮助”讲时，它相当于without help。

例句：There are many things one must do by oneself without depending on others.

有许多事情你必须自己去做，不能依靠别人。

3.当by oneself表示“自动地”讲时，主要用于by itself这个短语，含义相当于automatically。

例句：How did the door open by itself?

门怎么自己开了?