不定冠词，英语虚词冠词的一种，冠词是虚词，本身不能单独使用，也没有词义，它用在名词的前面，帮助指明名词的含义。下面是小编归纳的一些不定冠词的用法，以供大家学习参考。

不定冠词的用法 ：

1. 不定冠词表示“一个”、“某一个”、“ 每一”、“再一，又一”、或“同一，相同”等

Eg. Rome is not built in a day.

A Mr. Smith is waiting for you at the school gate.

He usually works eight hours a day.

You can try it a second time if you fail.

They are of an age./ Birds of a feather flocks together.

2. 不定冠词泛指某一类人或物，意为“任何一个，任一”

Eg: A square has four sides.

3. 当物质名词具体化表示“一(类、阵、份)”等;抽象名词具体化为“…… 的人或者事”时

Eg: Green tea is a wonderful tea.

We don’t have much rain here, but last night we had a heavy rain.

Reading is a pleasure for me.

The meeting is a great success.

4. 不定冠词表示季节、月份、日期、三餐的名词，或表示世上独一无二的物体名词前有形容词修饰时

Eg: We have a every cold winter last year.

This happened on a rain Sunday towards the end of May.

We hope we can see a full moon tonight.

5. 源于动词的名词与take/have 连用时

Take a look; take a walk; have a break; have a visit to…

6. ###不定冠词用于某些固定词组中

All of a sudden; as a matter of fact; as a result; as a rule; as a whole; at a distance; in a way; in a hurry; in a sense; in a word; do sb. a favour; have a good time; have a word with ; go for a walk; make a difference; make a fool of oneself; make a living; pay a visit to ; take an interest in; tell a lie; a good/wise knowledge of; a danger/threat to sb.; come as a surprise/shock; wish sb. a Merry Christmas…