one和a和an的区别是什么，求专业

辅音音素开头的名词或名词短语前用a，注意某些名词是元音字母开头但是首发辅音，还是加a

例：a university, a European, a one-parent family

元音音素开头的名词前加an，不发音的h打头的单词前也加an

例：an orange, an Italian, an umbrella, an hour, an hornour

如果缩写单词是按字母的方式读出来，并且以A,E,F,H,I,L,M,N,O,R,S或X开头，前面加an

例：an MP, an FBI agent, an IOU

如果缩写单词以一个完整的单词形式出现，前面加a或an

例：a NATO general, a FIFA official, an OPEC meeting

特例：a history (book)，an （或 a）historical (novel)

a/an用来形容一个非特指的人、物或事件

例：I really need a cup of coffee.

You never see a police officer in this part of town, do you?

数字或数量中用a或an

例：three times a year, half an hour, a quarter of an hour, a day or so, 50 cents a litre, a week or two, a few, a little, a huge number of ...

所属权一般用a而不是one

例：She's a colleague of mine.

That's a friend of Gabriel's.

单数可数名词前加a/an或one都是表示数量为1

例：We'll be in Australia for one year. （或...a year.）

Wait here for one minute, and I'll be with you. （或...a minute...）

one比a/an更强调时间的长短或数量的大小等

例：He weighs one hundred and twenty kilos! Would you believe it!

强调谈论的对象是1样东西或1个人，突出数量为1时，用one而不是a/an

例：Do you want one sandwich or two?

Are you staying only one night?

I just took one look at her and she started crying.

固定组合one...other/another中用one而不是a/an

例：Close one eye, and then the other.

Bees carry pollen from one plant to another.?

固定词组one day, one evening, one spring等表示某个特定的，但是不明确的日子、夜晚、春天等

例：Hope to see you again one day.

One evening, while he was working late at the office...

1．作“一（个）”讲，不定冠词a所表达的“数量”这一概念，远不如one这个数词来得明确和恰当（注：这样使用，a或an就是one的弱势形式。参见词目1、3和4）。 例如：I want to live a hundred years．—M．Swan．我想要活100岁。（是一种“姑妄言之”的说法，所以要用a，不用one） The journey took exactly one hundred days．—M．Swan．这次旅行整整历时100天。（这里说的是一个事实，所以要用one，不用a，并可加饰exactly这样一个副词） 比较：Give me an apple，will you？给我一只苹果，好吗？（是与some或any相对而言） Give me one apple，will you？给我一只苹果，好吗？（是与two、three…相对而言） We saw a panda in the Zoo this morning．今天早晨我们在动物园里看见一头熊猫。（是回答“What did you see in the Zoo this morning？”的提问，所以强调的是panda） We saw one panda in the Zoo this morning．今天早晨我们在动物园里看见一头熊猫。（是回答“How many pandasdid you see in the Zoo this morning？”的提问，所以强调的是one） “Can a boy carry it？”—“No，perhaps a man can．”“孩子拿 得动吗？”——“不，也许成年人拿得动。”（a不一定要跟two、three…相递增） “Can one boy carry it？”—“No，perhaps two boys can．”“一 个孩子拿得动吗？”——“不，也许两个孩子拿得动。”（one 必须跟two、three…相递增） It seems only a day or two since we first came．我们初到这里，好像只过了一、两天。（也许是一天或一天多或甚至两天） It seems only one or two days since we first came．我们初到这里，好像只过了一天或两天。（不是一天就是两天） It has rained for more than a week．雨已下了一星期多了（也许是八、九天）。 It has rained for more than one week．雨已下了不止一星期了。（也许是两星期） 2．作“同一”或“同样”讲，a所表达的“一体”这一概念，也不如one来得明快和响亮。 例如：In the old society，two of a trade could never agree．在旧社会同行是怨家。 We all march forward to one objective，i．e．，communism． 我们大家朝着一个目标——共产主义，前进

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