不是指明代替任何特定名词或形容词的代词叫做不定代词。常用的不定代词有：some, any, all , none, both, either, neither, each, every, other, another, much, many, few, little, one 等。下面笔者就几个典型不定代词进行分析。
1. both 全部，都，不定代词both指两个人或事物。可以用作主语、宾语、定语或同位语。例如：
Both would like to go swimming.(作主语)
We invited both to come to our farm.(作宾语)
Both films are interesting.(作定语)
They both like skating.(作they的同位语)
2. none 无人或无物不定代词none的含义和all相反，和no one，not any同义，但其用法相当于名词，在句子中一般作主语或宾语。它代替不可数名词作主语时，谓语动词用单数形式；代替可数名词作主语时，谓语动词用单、复数皆可。例如：
None of the problems is/are easy to solve. (作主语，代替可数名词)
None of the money is mine. (作主语，代替不可数名词)
I know none of them.(作宾语)
注：不定代词none表示"三个或三个以上都不……"，所以汉语的"我们(三人以上)都不去"译成英语为"None of us will go ."而不能译成"All of us will not go."后者译为"我们并不是个个都去。"
3. either 两者之中的任何一个不定代词either可以作主语、宾语和定语。例如：
Either of them will agree to this arrangement.(作主语)
Here are two books. You can borrow either of them.(作宾语)
I believe either method will work. (作定语)
4. neither 两个之中一个也不是不定代词neither是either的否定形式，可以作主语、宾语和定语。例如：
Neither is interesting. (作主语)
-Did you see Mary and Jack?
-No, I saw neither of them.(作宾语)
I think neither book is worth reading.(作定语)
注：a. 不定代词neither表示"两个都不"，所以汉语的"我俩都没去那儿"译成英语为"Neither of us went there."而不能译成 "Both of us did not go there."后者意为"我俩没都去那儿"。
b. 肯定形式的动词+neither=否定形式的动词+either。例如：
I like neither of them.=I don't like either of them.
5. other 其他的，另外的不定代词other相当于名词或形容词，可以在句中作主语、宾语、定语等。相当于名词时，有复数形式 others，还有所有格形式 other's 和others'。不定代词 other之前常用冠词 the。例如：
He has two daughters . One is a teacher, the other is a nurse.(作主语)
Some will go swimming, others will go shopping.(作主语)
I have two pictures of the Great Wall here. You have seen one. Now I'll show you the other .(作宾语)
There are other ways of helping him out of difficulty.(作定语)
6. another 另一个，又一个another是由an和other合并构成，因此，它只能代替或修饰可数的单数名词，前面不再用冠词。不定代词another可以在句中作主语、宾语、表语和定语。例如：
One is blind, another is deaf, and a third is lame.(作主语)
This shirt is too small for me. Please show me another . (作宾语)
She is a fool, and her husband is another.(作表语)
Would you like another cup of milk? (作定语)
You will have to stay here for another five days.(作定语，five days形式上是复数，但意义上是单数，可以和another连用)
7. one
1)不定代词one指不定人称，表示人，译为"人"，"一个人"等。它有反身代词oneself和所有格形式one's。
2)不定代词one也可以用来代替前面出现过的可数名词，以免重复。它有复数形式ones，可以与冠词连用，可以有自己的定语。
不定代词one可以在句中作主语或宾语；one's只能作定语。例如：
One has to do one's best. (one 作主语，one's作定语。)
Please give me the book, the one on the desk. (one作宾语)
(文/解学花；英语辅导报 大学一年级版 04～05学年第3期； 版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)
