12.29
反身代词：
1.做动宾或介宾
- teach oneself=learn by oneself
- enjoy oneself
- help oneself to...
- eg:The boy can dress himself
- Take good care of yourself
2.做主语或宾语的同位语
- eg: Alice herself is a pilot.
- eg: You had better ask the driver himself
3.做表语
- eg:Just be yourself.