He himself was a doctor. (同位语)
=He was a doctor himself.
She is too young to look after herself. (宾语)
I don't blame you, I blame myself(宾语).
He cut himself when he was cooking. (宾语)
That poor boy was myself.(表语)
注意：反身代词用于 be, feel, seem, look 等后作表语表示身体或精神所处的状态。如：
I'll be myself again in no time. 我一会儿就会好的。
He doesn't feel himself today.他今天感觉身体不舒服
I'm not quite myself these days. 我近来身体不大舒服。