(1)不定冠词:a / an a unit / an uncle

　　元音开头的可数名词前用an :

　　an egg / an apple / an orange / an eraser / an answer / an ID card / an alarm clock / an actor / an actress /

　　an e-mail / an address / an event / an example / an opera / an houran old man / an interesting book / an

　　exciting sport / an action movie / an art lesson /

　　(2)定冠词:the the egg the plane

　　2. 用法:

　　定冠词的用法:

　　(1)特指某(些)人或某(些)物: The ruler is on the desk.

　　(2)复述上文提到的人或物:He has a sweater. The sweater is new.

　　(3)谈话双方都知道的人或物:The boys aren’t at school.

　　(4)在序数词前: John’s birthday is February the second.

　　(5)用于固定词组中: in the morning / afternoon / evening

　　不用冠词的情况:

　　(1)专有名词前:China is a big country.

　　(2)名词前有定语:this , that , my , your , some, any , no 等:

　　This is my baseball.

　　(3)复数名词表示一类人和事:Monkeys can’t swim. They are teachers.

　　(4)在节日，日期，月份，季节前:Today is Christmas Day. It’s Sunday.

　　(5)一日三餐前:We have breakfast at 6:30.

　　(6)球类棋类运动前:They often play football after class. He plays chess at home.

　　但乐器前要用定冠词:I play the guitar very well.

　　(7)学科名称前:My favorite subject is music.

　　(8)在称呼或头衔的名词前:This is Mr Li.

　　(9)固定词组中:at noon at night by bus