a |an1 指一类人或事,相当于a kind of .
A plane is a machine that can fly.
2 第一次提及某人某物,非特指。
There is a tree in my garden.
3 用于人名前,表示不认识此人或与某名人有类似性质的人或事. — Hello, could I speak to Mr. Smith?
—Sorry, wrong number. There isn't______ Mr. Smith here.
A.不填 B. a C. the D. one
4 用于抽象名词具体化的名词前
success(抽象名词)→a ess(具体化) 成功的人或事
a failure 失败的人或事 a shame 带来耻辱的人或事
a pity 可惜或遗憾的事 a must 必需必备的事
5 用于quite, rather, many, half, what, such之后.
This room is rather a big one.
the1 表示某一类人或物.
In many places in China,thebicycle is still a popular means of transportation.
2 表示说话双方都了解的或上文提到过的人或事.
Bring me the book, please.
3 用于世上独一无二的事物名词前.
The moon, the ear
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