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网上老师授课高一

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Indefinite article (不定冠词)

我们用 "a , an " 当我们不知道他是诸多人或事中的哪一个:

* is one of many. ( 是许多个中的一个)

He is an artist.(=there are many artists)

* is not unique. (不是唯一的)

I have just bought a book

* has not been mentioned before. (之前没有提到过)

There was a new student in class today.

Definite article (定冠词)

我们用 " the " 当我们知道他是诸多人或事中的哪一个:

* is unique (or unique in that context) (是唯一的)

The Australian Prime Minister. (=there is only one)

I looked inside, the engine was in a terrible state.(=there is only one engine, in this case)

* has been mentioned before. (之前提到过)

The man gave me a ticket. I looked at it, and saw thatthe ticket was a single.

* is defined by the phrase which follows it. (要被接下来的短语详细说明)

What is the new student's name?

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