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 http://www.trgroup.com.cn/te/ ^5-3YTUQ^PbM&a&_R] 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 http://www.trgroup.com.cn/te/ }Qp}kTa%e]D6$hl{] 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 http://www.trgroup.com.cn/te/ ,` vRO::Cd3qJ8Y0V] There is an “f” in the word “four”. |