不定代詞:凡不是用來指明代替任何特定名詞的代詞叫做不定代詞。不定代詞代替名詞或形容詞.在句中可用作主語,賓語，表語和定語。不定代詞包括：

　　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.