定冠词的用法：
1.指谈话双方都知道的人或物。 -----Where is the new teacher ? -----She is in the office. 2.特指人或物。
The girl under the tree is Lucy. 3.指上文提过的人或物。
Last week, I got a bike. The bike is black.
4.世界上独一无二的事物。 The earth goes around the sun. 5.用于序数词和形容词最高级前。 He lived on the second floor.
She is the most popular singer in China now.
6.用与由普通名词构成的专有名词前。
the Great Wall the Teachers’ Day 7.用于一些习惯用语中。
in the morning ﹑the same﹑ by the way﹑on the left﹑in the end 8.用在由短语或从句修饰的名词前。
The key to the door is lost.
9.用在单数可数名词前，表示一类的物。
The whale is in danger.
10.用在复数名词前表示某类人的总称。
the league members
11.用在形容词前表示某一类人。 The rich the old the living
12.用在表示海洋、河流、山脉、群岛、某些国名组织机构、报纸、条约等前。
the USA the Atlantic the Alps
13.用某些词前表示阶级、民族、阶层。
the Chinese
14.用在姓氏的复数形式前表示“一家人”
the Greens the Whites 15.用在方位词前。
She is going to the south. 16.用在乐器前。
play the violin
不定冠词a/an 的用法：
1.用于可数名词的单数形式前，表示人或物的某一种类。
A child needs love.
2.表示一类事物中的任何一个。 A hose is bigger than a sheep.
3.表示数量，有“一”的含义。 There is a big market near my home. 4.用与固定词组中。
a few a little a lot of half an hour a pair of
5.数目的表示法：
a couple a cup of a pair of 6.用在某些物质名词前表示“一阵” “一种” “一份” He was caught in a rain . I’d like to have an ice-cream.
7.用在抽象名词前,表示动作的一次。 make a reply have a look 8.用在表示情绪的抽象名词前。 It is a pleasure 不能使用冠词：
1.在专有名词和不可数名词前。 China Grade Two
2.名词前已有作定语的修饰词，例如：形容词性物主代词，疑问代词，不定代词，数词等限定词。 She is watering some flowers.
3.复数名词表示某一类人或事物时。 My parents are both engineers. 4.在星期，月份，季节， 节日前。 In spring, the trees turn green.
We have an Art lesson on
Wednesday. th
March 8 is Women’s Day.
5.在一日三餐和球类运动及游戏前。 Many young girls don’t have breakfast .because they want to keep slim.
Most boys are interested in playing football.
6.在称呼或表示头衔的名词前。
Mr White is too poor to buy himself birthday cake every year. They chose him chairman. 7.在人名或地名的专有名词前。 John Brown London 8.在表示颜色的名词前。 My favourite colour is red. 9.在表示语言的名词前。 Can you sing in English ? 10.在表示学科的名词前。
We often have Chinese , English ,Maths lessons in the morning.
11.在成对使用的名词或名词形容词固定搭配前。
side by side shoulder and
shoulder husband and wife face to face father and son
rich and poor 12.在某些习语中。
at noon at last
13.两个形容词共有一个不定冠词，那么这两个形容词修饰的是同一人或物。
a writer and singer
She bought a red and blue pencil.
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