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 athome.
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.
