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、特指某(些)人某(些)事物，双方都知道的人或物或再次提到，基本上所有名词前都可用。
The bag in the desk is mine.
Is this the book you are looking for? Do you know the man in back?
It is not the car we are looking for.
The man has found his child.
I saw a film yesterday. The film was ended at eight o'clock.
Lucy bought a radio yesterday, but she found something was wrong with the radio.
2、用在西洋乐器前如play the piano/violin/guitar/drum
I like playing the piano
3、用于表示世界上独一无二的事物或用于自然界现象或方位名词之前。这些事物当然是特指的事物，不可能有两个以上。
如 the sun the moon the earth the sky the world the winter night
The sun is bigger than the moon.
I can see a bird in the sky.
I like to have a walk with the bright moon light in the evening.
4、定冠词与单数名词连用, 也可以表示这一类人或事物。
The dog is not too danger.
The cat is an animal. 。
The umbrella in the shop is very cheap in this season.
5、定冠词与形容词连用, 可表示某一类人或事物。如the poor the rich the old the young the blind
The wounded were brought to the hospital.
He always helps the poor.
The deaf can go to this special school.
6、the 用在姓名复数之前, 表示一家人。
The Greens is very kind to us.
The Whites like the classic music. 。
6、用在比较级、最高级或序数词前
the +比较级…… the +比较级…… 表示越……越
the longer you stay, the better it will be
She said thee best way to learn English was by reading English magazine.
The first lesson is easy.
7、用在定语从句或介词短语所修饰的名词前
The girl in red is her friend.
怎么样，看完了这篇文章，大家是不是对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~