英语中“a”和“an”的具体用法?

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英语中“a”和“an”的具体用法?

英语中“a”和“an”的具体用法?
英语中“a”和“an”的具体用法?

英语中“a”和“an”的具体用法?
a
[E,eI]
indefinite art
(用在以元音开始的词前为 an [An]) an
[ An; En ]
art.一(在元音字母前代替不定代词a)

a pen
一枝笔
a car
一辆汽车
a dollar
一美元
a dozen pens
一打笔
an egg
一个鸡蛋
Can I have a tea and two coffees.
请给我一杯茶和两杯咖啡.
(一类事物中的)任何一个
not a one
没有一个
Let's go to a Chinese restaurant.
我们去一家中餐餐馆.
We saw a good film on TV last night.
昨天晚上我们在电视中看到了一个好片子.
任何
A square has four sides.
正方形有四条边.
A dog is an animal.
狗是动物.

楼上的不对
不是元音字母,而是发音
第一个音节发a,e,i,o,u的音的用an
其他用a

定冠词(indefinite articles) a/an 的用法。
  不定冠词最基本的用途就是用来表示“一”这概念,如:
  ① A stitch in time saves nine.
  ② Jason is an internationally known scholar.
  此外,a/an 还有下列 6 种用途:
  一常和time、...

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定冠词(indefinite articles) a/an 的用法。
  不定冠词最基本的用途就是用来表示“一”这概念,如:
  ① A stitch in time saves nine.
  ② Jason is an internationally known scholar.
  此外,a/an 还有下列 6 种用途:
  一常和time、measurement等有关的名词连用,以表示“每—” 的概念,如:
  ③ I teach five days a week.
  ④ This type of vegetables is sold at one dollar a kilo.
  ⑤ My car usually runs sixty kilometres an hour.
  二常和 hundred, thousand, dozen 以及数目及数量连用,如:
  ⑥ That factory turns out at least a hundred tyres a day.
  ⑦ Noel's monthly salary is a thousand dollars.
  ⑧ I have a number of sponsored students.
  ⑨ Mary has a lot of money.
  三在“of / at”后面出现,以表示“同一类”这概念,如:
  ⑩ Birds of a feather flock together.
  11. Please come one at a time.
  12. Things of a kind come together, so do people of a mind.
  四常在“rather, quite, many, half, what, such”等字后面出现,形成固定用法,如:
  13. Tom is rather a fool.
  14. I think Chinese is quite a useful language.
  15. Many a student has asked that question.
  16. The visitor left half an hour ago.
  17. What a fine day it is!
  18. How can you say such a thing?
  五用在“so, as, too, how +形容词”这些结构里,如:
  19. We have not had so hot a day before.
  20. Susan is as clever a girl as Anna.
  21. That is too difficult a book for beginners.
  22. No one knew how serious a problem it was until later.
  六出现在许多惯用语中,如:
  23. Bob always has a bone to pick with others.
  24. Some students turned a deaf ear to the teacher's advice.
  25. All must learn a language with an eye to mastering it.
  26. I hope you will make an effort to attend the meeting punctually.
  27. Jason has an aversion to being idle.
  28. The news of Jack's sudden resignation came as a bolt from the blue.

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a,e,i,o,u或在读音上有这几个发音的加an

不定冠词a (an)与数词one 同源,是"一个"的意思。a用于辅音音素前,一般读作[e],而an则用于元音音素前,一般读做[en]。
 1) 表示"一个",意为one;指某人或某物,意为a certain。例如:
   A Mr. Ling is waiting for you. 有位姓凌的先生在等你。
 2) 代表一类人或物。例如:
   A knife i...

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不定冠词a (an)与数词one 同源,是"一个"的意思。a用于辅音音素前,一般读作[e],而an则用于元音音素前,一般读做[en]。
 1) 表示"一个",意为one;指某人或某物,意为a certain。例如:
   A Mr. Ling is waiting for you. 有位姓凌的先生在等你。
 2) 代表一类人或物。例如:
   A knife is a tool for cutting with. 刀是切割的工具。
   Mr. Smith is an engineer. 史密斯先生是工程师。
 3) 组成词组或成语,如a little / a few / a lot / a type of / a pile / a great many / many a / as a rule / in a hurry / in a minute / in a word / in a short while / after a while / have a cold / have a try /keep an eye on / all of a sudden等

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a和an同样是一个的意思的,但用法不同.an的后面加的名词一定要是元音字母开头,比如:an apple,an egg..

a 后面接的是以辅音开头的词 不一定是以辅音字母开头的 比如 A university(大学)
an 后面接的是以元音开头的词 不一定是以元音字母开头的 比如 AN hour

这个语法书上都有嘛``

元音字母