oneself用作介词，有自己，自身的含义。可用作及物动词的宾语，也可用作介词的宾语。用于主语、宾语、补语的同格时，加强其意义。
1.oneself用作介词
One can congratulate oneself on one's victories.
一个人也可以自己庆祝自己的胜利。
One should be strict with oneself.
一个人应对自己要求严格。
How should my friend safeguard the rights and interests of oneself?
我的朋友该如何维护自身的权益呢?
So video license plate is not all-purpose, important still is oneself superintend.
所以视频牌照并不是万能的，重要的还是自身监管。
2.oneself作宾语
（1）有些动词需有反身代词
absent,bathe,amuse,blame,dry,cut,enjoy,hurt,introduce,behave
We enjoyed ourselves very much last night.我们昨晚玩得很开心.
Please help yourself to some fish.请你随便吃点鱼.
（2）用于及物动词+宾语+介词
take pride in,be annoyed with,help oneself to sth.
I could not dress myself up at that time.那个时候我不能打扮我自己.
3.by oneself 是指亲力亲为,自己做的意思。
例如：I should do it by myself.我应该自己做这个。
4.for oneself为了自己
例如：what you do is not just for youself.你做的这并不仅仅是为你自己。
