a/an所有用法

There is an apple on the table.

泛指—类人或物。

A student must study hard.

用在序数词前,相当于another.

There's a third boy near the shop.

不定冠词用于某些固定短语中。

have a try试一下

take a break 休息一下

have a good time 玩得痛快

make a living 谋生

as a matter of fact 事实上

in a word 总而言之

give a lesson 教(一堂)课

have a rest 休息

have a fever 发烧

have a good time 过得愉快

中小学英语语法基础——不定冠词a,an的用法

不定冠词a, an的用法

不定冠词a, an用于名词之前，表示“一个”或“一”。a用于以辅音开头的名词前，an用于以元音开头的名词之前。

1.第一次提到某人或某物时，用不定冠词a或an起介绍作用。

What is her mother? She is a nurse.

她母亲是干什么的? 她是护士。

2.表示一类中的一个。

I only know it was a dog not a cat that bit me.

我只知道咬我的是只狗，不是猫。

3.表示任何一个，泛指一类。

An elephant is stronger than a horse.

大象比马力气大。

4.用于专有名词之前，表示说话人不知道的人或事。

A Mr Smith called you.

有位叫史密斯先生的给你打过电话。

A Wang is looking for you.

一位姓王的同志正在找你。

5.表示单位、数量、长度、时间等。

I write to my father once a week.

我每一星期给我父亲写一封信。

I wash face three times a day.

我每天洗三次脸

6.在月份、星期及evening, night, morning, afternoon等名词前有修饰定语时，一律用a.

A cold March is usual in the Northeast.

东北的三月往往是冷的。

On a windy morning he came back.

7.表示“the same”的意思。

The two shirts are much of a size.

两件衬衣大小差不多。

Birds of a feather flock together.

物以类聚

8.用在“such a ...”“quite a ....”“many a ....”“rather a ...”“so+形容词+a+单数可数名词”的结构中。

His lazy son is quite a bother to him.

他的懒儿子很令他伤脑筋。

Many a man comes to work here.

很多人到这里干活。

I had so wonderful a day yesterday that I was very excited.