1、含有-one和-body的不定代词功能和意义基本相同，含有-one的不定代词比含有-body的不定代词正式。
2、所有不定代词都当作单数对待。
Someone is asking to see you. / Nobody is absent.
3、带有some的复合不定代词一般用于肯定句，带有any的复合不定代词一般用于否定句和疑问句。
Someone suggests putting off the meeting.
Did you meet anyone on your way home.
★含有some的复合不定代词也可以用于疑问句中，表示肯定的的意思。含有any的复合不定代词也可以用于肯定句中表示“任何人”或“任何事”。
Why don't you say something? Anybody can go.
4、somebody和nobody可以表示“重要人物”和“小人物”的意思。
He thinks himself a somebody, but he is nobody.
5、else和形容词作复合不定代词的定语时都要后置。
He wanted to read something interesting.
He wants to see nobody else.
