二.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(kāi)頭的可數(shù)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(fù)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(shù)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(yǔ)：this , that , my , your , some, any , no 等：

　　This is my baseball.

　　（3）復(fù)數(shù)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(yùn)動(dòng)前：They often play football after class. He plays chess at home.

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

　　（7）學(xué)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