如：Nobody is late for the meeting .(复合不定代词nobody作主语)
I know nothing about the accident.(复合代词nothing 作宾语)
That's nothing.没什么。(复合代词nothing作表语)
2) 英语中的不定代词如：all, both, either, neither, little, a little, some, any , many, other , another等，多数都可以作主语、宾语、表语和定语，但no和every只具有形容词性质只能作定语，none只具有名词性质，不能作定语。
如：Time waits for no man.时不我待。(no 作定语)
Every room is bright.每个房间都很明亮。(every作定语)
None of them has been to Paris.他们中没有一个去过巴黎。(none作主语，强调单一性，谓语用单数)
None of them were aware of the danger.他们都没有意识到有危险。(none强调整体性，谓语用复数)
3) .it 的用法
1) 用作人称代词，代替前文提到的事务
The frog is not a warm-blooded animal .It's a cold-blooded one.
2) 用以代替指示代词
What's this? It's a flag.
3) 起指示代词的作用，指一个人或事物
Who's knocking at the door? It's me.
4) 指环境情况等
It's noisy in the classroom.
5) 指时间，天气，季节，距离等
It's a long way to the factory.
6) 做形式主语，形式宾语，如：
It's not a good habit to stay up late.
I found it difficult that I finished the task by myself.
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