冠词的学习是英语中很重要的一部分，冠词又分为定冠词和不定冠词以及零冠词。今天，小编为大家准备了相关的语法知识，将要为大家来讲解一下：不定冠词的概念和用法，一起来看看吧！

1、 a / an 用在单数可数名词前面，表示这个人或事物是泛指的不确定的一个，相当于中文的“一个”。通常在第一次提到某人或某物时用a / an

I gave him a book yesterday.   I am reading an interesting story.

I have got a ticket.           There is a tree in front of my house.

用在不可数名词前面意义上也有变化如wood 木头, a  wood 一片树林power威力, a power大国 / beauty 美丽, a beauty美人, a strong wind 一阵强风

2、a 用在读音为辅音开头的名词之前,  而 an 用在读音为元音开头的名词之前。例如： a university (虽然u 是元音字母，但不读元音。)  an hour (虽然h 不是元音，但单词读音是元音开头)

3、用其中的任何一个，代表他们所属种类的特性。 

A horse is useful to mankind. 马对人类有用。 

A bird can fly. 鸟会飞。 

A steel worker makes steel. 炼钢工人炼钢。 

4、用在事物的度量单位前,  如时间、 速度、 价格等, 表示 "每一个"。 

We often go to school two times a day.  

I went to the library once a week at least.   

5、用于某些特定的词组。 例如：a few 几个， a little 有点，等等。

 She has a few friends in this city. 

There is a little milk in the bottle. 

Only a few students are in the classroom.

当有such what many so how too quiet rather very修饰时

He left in such a hurry that he forgot to close the door.

What an interesting book it is!

Many a man has gone to big cities for work.

She was so nice a girl that she took the blind man to the station.

How nice a film this is!

Quite a good book

Rather a /a rather useful tool

A very interesting story.

怎么样，看完了这篇文章，大家是不是对不定冠词的概念和用法有了初步的了解了呢？喜欢就赶快收藏起来吧~