(6) a = a certain, 表说话者不认识此人。
Do you know a Mr. Smith?
(7) 物质名词或抽象名词加a (an)即成普通名词,
Asparagus is a grass. (a = a kind of) ;
This is a good cloth for summer.
(8) have (or take) + a + 抽象名词,与抽象名词的动词形同义。
Let us take a swim. = Let us swim.
2. 定冠词的用法:
(1) 由于上下文的关系, 某名词所指的东西已非常明显, 或已有一定的范围, 该名词应加the.
Shut the door.
Please pass me the caster.
(2) 表该名词的总称。
The cow is a useful animal. (= Cows are useful animals.)
(3) 前面已提过的名词,再度提到时前面加the.
Once upon a time there was a little boy who lived in a cottage.
The cottage was in the country, and the boy lived there all his life.
(4) 用于为片语或子句所修饰的名词之前。
This is the book that I promised to lend you.
(5) 用在宇宙(独一无二)的天体名词之前。
The sun; the moon; the sky; the earth;
(6) 用在方位,方向等名词之前。
The sun rises in the east and set in the west.
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