a和an的用法口訣:不定冠詞a和an,?a后輔音an后元，泛指一類或一個，表數語氣比one弱,序數詞前表又再，most前意非凡，抽象物質動變名，化為具體用法靈，用錯a/an被人笑，單名泛指被丟掉，指代物代所有連，位置放錯更無顏。

a和an的用法口訣

不定冠詞a和an,單數可數名詞前;

輔音若在詞首發(fā),詞前只把a來加;

元音若在詞首放,詞前an詞不敢忘;

不定冠詞相當one,但不強調數觀念;

不定冠詞很關鍵,四個所指記心間.(每指、泛指、類指和某指)

不定冠詞a/an的用法

不定冠詞有兩個，a 和 an。a用在輔音開頭的單詞前面;an用于以元音開頭的單詞前。如：a book, an apple。具體用法如下：

1)表示“一個”、“某一個”、“ 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)泛指某一類人或物，意為“任何一個，任一”

Eg:

A square has four sides.

3)當物質名詞具體化表示“一(類、陣、份)”等;抽象名詞具體化為“……的人或者事”時

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)表示季節(jié)、月份、日期、三餐的名詞，或表示世上獨一無二的物體名詞前有形容詞修飾時

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)源于動詞的名詞與take/have 連用時

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