a和an的用法口诀:不定冠词a和an,a后辅音an后元,泛指一类或一个,表数语气比one弱,序数词前表又再,most前意非凡,抽象物质动变名,化为具体用法灵,用错a/an被人笑,单名泛指被丢掉,指代物代所有连,位置放错更无颜。

a和an的用法口诀

不定冠词a和an,单数可数名词前;
辅音若在词首发,词前只把a来加;
元音若在词首放,词前an词不敢忘;
不定冠词相当one,但不强调数观念;
不定冠词很关键,四个所指记心间.(每指、泛指、类指和某指)

不定冠词a/an的用法

不定冠词有两个,a 和an。a用在辅音开头的单词前面;an用于以元音开头的单词前。如:a book, an apple。具体用法如下:
1)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)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)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…