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不定代词：
即不指明代替任何特定名词或形容词的代词.
初中常用不定代词有：
some（something,somebody,someone）,any（anything,anybody,anyone）,no（nothing,nobody,no one）,
every（everything,everybody,everyone,）,all,each,both,much,many,（a）little,（a）few,other（s）,
another,none,one,either,neither等.一般来讲,修饰不定代词的词要置于其后.
不定代词用法例举：
①一般用于肯定句中的不定代词：some,someone,somebody,something
例如：They can speak some Japanese.
②一般用于否定句、疑问句和条件句中的不定代词：any,anyone,anybody,anything
例如：Is there anyone at home?
③一般用于句中表示否定意义的不定代词：no,no one,nobody,nothing
例如：I have no watch.
There is nothing wrong with the machine.
④不定代词one指代可数名词,既可指人,亦可指物,它可以代替上文中出现的单数可数
名词,指代复数名词时可以用ones.
例如：I do not have a pen,can you lend me one?
I like small cars better than large ones.
⑤none通常只用作名词,在句中作主语、宾语等.意为“没有任何（人或物）”,既可指人,亦可指物.
none后常跟of短语,其后用复数可数名词或不可数名词.
例如：None of them knows the answer to the question.
⑥both,all
both指两个人、物或群体；
all指三个以上的人、物或群体或泛指一切事物.
例如：My parents are both teachers.
All of my friends are football fans.
⑦every,each
each一般用于指两个或两个以上的人或物,侧重个别；
every用于指三个或三个以上的人或物,侧重全体.而且each所指对象在上下文中已十分明确.
例如：Each student went to see that films.(学生至少二人)
Every student went to the park.（学生至少三人）
⑧other,the other,others,the others,another
other具有名词和形容词性质,既可指人,亦可指物.other常与定冠词the连用.
不定冠词an与other连用则组成another.other只作形容词或代词,表示“其他的,别的”,不可单独使用.
例如：Do you have any other questions?
the other作形容词或代词,特指两者中或两部分的另一个或另一部分.
例如：The bookshop is on the other side of the street.
others相当于“other+名词”,泛指“别的人或物”,只有名词性用法.
例如：Some are planting trees,others are watering them.
the others相当于“the other+名词”,表示“剩下的,其余的”,特指除此之外的全部 人或物.
例如：There are forty-six students in our class.Two of them are foreign,the others are all Chinese.
another作形容词或代词,泛指三个或三个以上不定数目中的“另一个”.
例如：This pen is too expensive,please show me another.
⑨either,neither
either指“两者中的任何一个”；neither指“两者中无一”,具有否定意义.
例如：You can take either half.
Neither of the books is good.
⑩many,much,most
many和much具有名词和形容词的性质,都表示“许多、大量”.
Much一般只能指代或修饰不可数名词,many只能指代或修饰复数可数名词.Most指“大部分、大多数”.
例如：Many boys like playing soccer.
We have much homework to do every day.
Most students think so.
(11)few,a few,little,a little
a few 和a little 意为“少数、少量”,其意义是肯定的.
A few指代或修饰复数形式的可数名词,a little指代或修饰不可数名词.
Few 和little意为“几乎一点没有”,具有否定意义.
例如：He has a few friends here.
Hurry up!There is little time left.
不定代词的用法：
不定代词大都可以代替名词和形容词,在句中作主语、宾语、表语、定语和状语.
位置
不定代词+形容词
不定代词+to do
作主语
Both of them are teachers．他们两人都是教师.
作宾语
I know nothing about this person．我对这个人一无所知.
作表语
This book is too much for a child．这本书对一个小孩来说太难了.
作定语
There is a little water in the glass．玻璃杯里有一些水.
作状语
I can't find my book anywhere．我在任何地方都不能找到我的书.
修饰不定代词的词,一般情况下要后置.