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~