|
用法 |
例词或例句 |
| 用于可数名词的单数形式前，指人或事物的某一种类。 |
This is a book. I'm a League member. |
| 指某人或某物，但不具体说明是何人或何物。有“每一”的含义。 |
We have three meals a day. [文章来自:考试与评价 =Q ?a+P .?AZDS-eC]
We go to school five days a week. |
| 表示“一”这个概念，但数的概念没有one强。 |
There is a flower in the corner. [文章来自:考试与评价 Vv ;o1g 3~\=��?}]
I have an American friend. |
| 指某类人或事物中的任何一个。 |
A bicycle has two wheels. |
| 用于某些固定词组中。 |
a lot(of)， a little/bit， a few， a pair of， half an hour，have a good time， a kind of，a number of，give a call， have a talk with， a piece of， make a contribution to |
| a 用于以辅音音素（包括/w/，/j/）开始的词前，an 用于以元音音素开始的词前。 |
a useful book， a university， an hour; [文章来自:考试与评价 (f
= B]Zl{q= `}q]
There is an “f” in the word “four”. |
