不定冠词a和an的用法

不定冠词有两个，a 和 an。a用在辅音开头的单词前面；an用于以元音开头的单词前。如：a book, an apple。具体用法如下：
1）表示“一个”、“某一个”、“ 每一”、“再一，又一”、或“同一，相同”等
Eg.Rome is not built in a day.
A Mr. Smith is waiting for you at the school gate.
He usually works eight hours a day.
You can try it a second time if you fail.
They are of an age./ Birds of a feather flocks together.
2）泛指某一类人或物，意为“任何一个，任一”
Eg:A square has four sides.
3）当物质名词具体化表示“一（类、阵、份）”等；抽象名词具体化为“……的人或者事”时
Eg:Green tea is a wonderful tea.
We don’t have much rain here, but last night we had a heavy rain.
Reading is a pleasure for me.
The meeting is a great success.
4）表示季节、月份、日期、三餐的名词，或表示世上独一无二的物体名词前有形容词修饰时
Eg:We have a every cold winter last year.
This happened on a rain Sunday towards the end of May.
We hope we can see a full moon tonight.
5）源于动词的名词与take/have 连用时
Take a look; take a walk; have a break; have a visit to…
6）其他不定冠词a/an的用法（固定搭配）
All of a sudden; as a matter of fact; as a result; as a rule; as a whole; at a distance; in a way; in a hurry; in a sense; in a word; do sb. a favour; have a good time; have a word with ; go for a walk; make a difference; make a fool of oneself; make a living; pay a visit to ; take an interest in; tell a lie; a good/wise knowledge of; a danger/threat to sb.; come as a surprise/shock; wish sb. a Merry Christmas…
**不定冠词a/an的用法口诀：
以下便是不定冠词的用法口诀：
不定冠词a和an,单数可数名词前；
辅音若在词首发,词前只把a来加；
元音若在词首放,词前an词不敢忘；
不定冠词相当one,但不强调数观念；
不定冠词很关键,四个所指记心间.（每指、泛指、类指和某指）

决大多数以元音字母开头的单词都是用an，以辅音字母开头的都是用a,但是也有例外。
正如你所说European的读音是jur'pn.其中它的读音首先出来的音是ju的音，j是辅音，所以用a，同理，比如单词university虽然首字母是元音字母，但是它的音标也是以辅音开头，所以用a来限定。
在这里我提醒一下亲，用a还是用an关键是看名词的发音音标而不是单看它首字母是不是元音。

是的 应该用a
an用于后面的单词为元音音素开头的单词前

定冠词the的用法.1.表示上文已经提到过的人或者物,或特指某人或某物.例如 give me the book.2.表示这世上独一无二的东西.例如 the sun,the moon,the air.3.对两个人或物进行比较时起特定作用的比较级前.例如 He is the tallest student in our class.All the better.4.用在形容词最高级、序数词及last,next,only,same,right,wrong前.5.用在江河、海洋、山川、群岛、港湾等名词前.注意:湖名前一般不加冠词.不定冠词A/AN的用法.1.泛指人或物.2.表示one/every.3.用在抽象名词前.表示一种、一类、这种等等.4.用在物质名词前.例如 A glass,a iron,an apple.

对，应该用a