冠詞：不定冠詞，定冠詞種類：

　　(1)不定冠詞：a / an a unit / an uncle 元音開頭的可數名詞前用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)定冠詞：the the egg the plane

　　2. 用法:

　　定冠詞的用法：

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

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

　　(3)談話雙方都知道的人或物：The boys aren't at school.

　　(4)在序數詞前： John's birthday is February the second.

　　(5)用于固定詞組中： in the morning / afternoon / evening

　　不用冠詞的情況：

　　(1)專有名詞前：China is a big country.

　　(2)名詞前有定語：this , that , my , your , some, any , no 等：

　　This is my baseball.

　　(3)復數名詞表示一類人和事：Monkeys can't swim. They are teachers.

　　(4)在節(jié)日，日期，月份，季節(jié)前：Today is Christmas Day. It's Sunday.

　　(5)一日三餐前：We have breakfast at 6:30.

　　(6)球類 棋類運動前：They often play football after class. He plays chess at home.

　　* 但樂器前要用定冠詞：I play the guitar very well.

　　(7)學科名稱前：My favorite subject is music.

　　(8)在稱呼或頭銜的名詞前：This is Mr Li.

　　(9)固定詞組中：at noon at night by bus