冠詞的學習是英語中很重要的一部分，冠詞又分為定冠詞和不定冠詞以及零冠詞。今天，小編為大家準備了相關的語法知識，將要為大家來講解一下：不定冠詞的概念和用法，一起來看看吧！

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1、?a / an 用在單數可數名詞前面，表示這個人或事物是泛指的不確定的一個，相當于中文的“一個”。通常在第一次提到某人或某物時用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.

用在不可數名詞前面意義上也有變化如wood 木頭, a? wood 一片樹林power威力, a power大國 / beauty 美麗, a beauty美人, a strong wind 一陣強風

2、a 用在讀音為輔音開頭的名詞之前,? 而 an 用在讀音為元音開頭的名詞之前。例如： a university (雖然u 是元音字母，但不讀元音。) ?an hour (雖然h 不是元音，但單詞讀音是元音開頭)

3、用其中的任何一個，代表他們所屬種類的特性。?

A horse is useful to mankind. 馬對人類有用。?

A bird can fly. 鳥會飛。?

A steel worker makes steel. 煉鋼工人煉鋼。?

4、用在事物的度量單位前,? 如時間、 速度、 價格等, 表示 "每一個"。?

We often go to school two times a day. ?

I went to the library once a week at least. ??

5、用于某些特定的詞組。?例如：a few 幾個， a little 有點，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.

當有such what many so how too quiet rather very修飾時

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.

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怎么樣，看完了這篇文章，大家是不是對不定冠詞的概念和用法有了初步的了解了呢？喜歡就趕快收藏起來吧~