1. 可用作宾语，指的是宾语和主语表示同一个或同一些的人或事物。
如：Maria bought herself a scarf.
We must look after ourselves very well.
2. 可用作表语，指的是表语和主语表示同一个或同一些人或事物。
如： She isn’t quite herself today.
3. 可用作主语或宾语的同位语，常用来加强语气。
如：She herself will fly to London tomorrow.
I met the writer himself last week.
4. 用在某些固定短语当中。
如： look after oneself / take care of oneself 照顾自己
teach oneself sth./ learn sth. by oneself自学
enjoy oneself 玩得高兴，过得愉快
help oneself to sth 请自用……(随便吃/喝些……).
hurt oneself摔伤自己
say to oneself自言自语
leave sb. by oneself把某人单独留下
buy oneself sth.给自己买……东西
introduce oneself 介绍……自己