二.冠词：不定冠词，定冠词种类：

　　（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