1、反身代词不能作主语,但是它可以作主语同位语,放在主语后或句末。
I went to the cinema myself.
2、反身代词作宾语的同位语。
I wish I could hear Beethoven himself play this music.
You can go and ask him himself.
3、反身代词作介词的宾语。
Nobody, she learnt it all by herself.
I mended the bike by myself.
Don't always think of yourself.
4、反身代词作动词的宾语。
Did you enjoy yourselves at the weekend?
He teaches himself English at home.
He can buy himself a lot of nice things.
5、反身代词作表语。
I'm not quite myself today.
He doesn't seem himself this morning. 
反身代词不可做什么成分
反身代词除了在句中作宾语和(主语或宾语的)同位语外,不可充当其它一成分。
反身代词的用法:
1、反射用法作宾语
例如:He teaches himself maths.他自学数学。
2、强调用法(作主语或宾语的同位语)
例如:I gave the book to him myself.
我亲自把那本书交给了他。
I gave the book to him himself.
我把那本书交给了他本人。