顾名思义，不定代词不指定具体的人、物或数量。大部分不定代词不是指示单数就是指示复数，但是有些不定代词既可以指示单数，也可指示复数。单数不定代词使用单数动词，相应的任何人称代词在数量或性别上也应该一致，复数不定代词也一样。 一、常见的指代单数的不定代词1. another 再一；另一（事物或人）That ice-cream was good. Can I have another?那冰淇淋很好吃。我能再来一杯吗？
解析：another 还可以作形容词，例如： I'd like another drink, please.请给我再来一杯。2. anybody/anyone 任何人Can anyone answer this question?有人能回答这个问题吗？3. anything 任何东西，任何事物The doctor needs to know if you have eaten anything in the last two hours.医生需要知道你在过去两个小时里有没有吃过东西。4. each 每个人Each has his own thoughts.每个人都有自己的想法。5. either （两者中的）任何一个Do you want tea or coffee?你要茶还是咖啡？I don't mind. Either is good for me.我不介意。任何一个都可以。6. enough 足够，充分，充足Enough is enough.适可而止。解析：第一个 enough 是不定代词作主语，第二个 enough 是形容词作表语。7. everybody/everyone 每人，人人，所有人We can start the meeting because everybody has arrived.我们可以开始开会了，因为大家都到了。8. everything 所有事物，一切They have no house or possessions. They lost everything in the earthquake.他们没有房子和财产。他们在地震中失去了一切。9. less 较少Less is more.较少就是较多。10. little 一些，少量Little is known about his early life.他早年的生活鲜为人知。11. much 许多，大量Much has happened since we met.自从我们见面以来发生了很多事。12. neither 两个都不，（两者之中）无一个I keep telling Jack and Jill but neither believes me.我一直告诉杰克和吉尔，但他们都不相信我。13. nobody/no-one 没有人，无人I phoned many times but nobody answered.我打了很多次电话，但没人接。14. nothing 没有什么，没有一件东西If you don't know the answer it's best to say nothing.如果你不知道答案，最好什么也不说。15. one （泛指）人 Can one smoke here?这里能抽烟吗？
All the students arrived but now one is missing.所有的学生都到了，但现在有一个不见了。16. other 其他One was tall and the other was short.一个很高，另一个很矮。17. somebody/someone 某人 Clearly somebody murdered him. It was not suicide.显然有人谋杀了他。不是自杀。18. something 某事，某物 Listen! I just heard something! What could it be?听！我刚听到什么！可能是什么？19. you （泛指）任何人You learn a language better if you visit the country where it is spoken.如果到说某种语言的国家去，就会把这种语言学得更好。二、常见的指代单数的不定代词1. both 两个，两个都John likes coffee but not tea. I think both are good.约翰喜欢咖啡，但不喜欢茶。我觉得两者都不错。2. few 很少人（或事物、地方）Few have ever disobeyed him and lived.很少有人违抗过他而活了下来。3. fewer 较少数Fewer are smoking these days.现在吸烟的人越来越少了。4. many 许多，大多数人 Many have come already.很多人已经来了。5. others 其他人 I'm sure that others have tried before us.我相信其他人在我们之前已经尝试过了。6. several 几个，数个，一些 They all complained and several left the meeting.他们都抱怨了，有几个人离开了会议。7. they 人们，人人，众人 They say that vegetables are good for you.人们说蔬菜对你有好处。
三、常见的既可以指代单数也可以指代复数的不定代词 1. all 全体，一切All is forgiven.一切都被原谅了。All have arrived.都到了。2. any 任一，任何一些Is any left?还有剩下的吗？Are any coming?有人来吗？3. more 更多There is more over there.那边还有更多。More are coming.更多的人来了。4. most 大多数，几乎所有Most is lost.大多数都丢失了。Most have refused.大多数都拒绝了。5. none 没有一个They fixed the water so why is none coming out of the tap?他们把水修好了，为什么没有水从水龙头里出来？I invited five friends but none have come.我邀请了五个朋友，但没有一个来。6. some 有些，部分Here is some.这里有一些。Some have arrived.有些已经到了。7. such 这样的，那样的He was a foreigner and he felt that he was treated as such.他是个外国人，他觉得自己受到了这样（外国人）的待遇。
