不定代词:凡不是用来指明代替任何特定名词的代词叫做不定代词。不定代词代替名词或形容词.在句中可用作主语,宾语，表语和定语。不定代词包括：

some, any, no, every

-thing: something, anything, nothing, everything

-one: someone, anyone, anything, everyone

-where: somewhere, anywhere, anywhere, everywhere

-body: somebody, anybody, nobody, everybody

例子：

1)Help! Somebody? Anybody?

2)Where did you go? I went nowhere.

3)Nobody is at home.

4)You are really something.

5)I looked for my book everywhere, but I cant find it anywhere.

6)If you want to go somewhere, if you want to be someone, you must wake up.

7)Since everybody is here, lets begin our class.