1.some相关的复合不定代词常用语肯定句中。any相关的复合不定代词常用语否定句和疑问句中。

There is someone singing in the next room.

There isn't anyone singing in the next room.

Is there anyone singing in the next room？

2. some相关的复合不定代词也可用于疑问句中表征询意见或提出请求。

Would you like something to drink？

3.复合不定代词做主语时，谓语动词常为单数。

Everything is OK.

Not everyone likes apples.

Someone is knocking the door.

4.复合不定代词在反义疑问句中，当陈述句的主语表人时，简略问句的主语常用they；当陈述句的主语表物时，简略问句的主语常用it.

Everybody has a computer, don't they？

Everything is OK,isn't it？

5.复合不定代词的修饰词常放其后。

I can nothing else.

I have something important to say.

6.everyone=everybody,只能指人；every one 既可指人也可指物，还可以和of短语连用。

I hope that everyone is happy.

Everyone/Every one likes the girl.

I have kept every one of his letter.