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一、定冠词的用法

定冠词the 有this, that, these, those等意思，用于单数或复数名词前。主要用来特指，使一个或几个事物区别于所有其他同名的事物。

1、指前文已经提到过的人或事物。如：I wrote an article. The article was about physics.

2、指说话人都知道的人或事物。如：Please close the door before you leave.Let’s go to the classroom.

3、名词有定语修饰时，须用定冠词the,表示特指意义。如：The book on the desk is his.The teacher who talked with you is her mother.

4、用于世界上独一无二的事物前。如：the sunthe moonthe earththe skythe world

5、用在序数词前面表示顺序。如：I live on the fourth floor.My mother is always the first one to come and the last one to leave.

6、与其他词连用，构成固定词组。如：on the leftin the northin the front of

7、在表示乐器名称的名词之前用定冠词。如：the pianothe violin

8、用在形容词或副词的最高级前面。如：This was the most interesting voyage we had ever had.He is the tallest of us

9、用在形容词前面，表示复数意义的某一类人或事物。如：the richthe poorthe youngthe livingthe newthe rightthe truethe beautiful

10、在表示江河、山脉、海湾、海峡、沙漠等专用名词之前加定冠词。如：the Changjiang Riverthe Nilethe Alpsthe Himalayas

11、用在年代、朝代、时代名词前。如：the Qin Dynastythe Ming Dynastyin the 50’sthe spring period

12、和表示姓氏名词的复数形式连用，表示某姓氏一家人或夫妇二人。如：the Listhe Martins

二、不用冠词的情况

1、除一些特殊情况外，专用名词以及抽象名词和物质名词前不加冠词。如：Man is mortal.Miss Smith came in power at last.

2、当名词前已有this, that, my, his, any, every, some, no, those, these等词修饰时或有所有格修饰时，不必加冠词。如：She is my sister.This article you had written is very wonderful.

3、在交通工具、学科名称等名词前不加冠词。如：by planeby boatChinesePhysics