一．下列情况只能用“a/an”
1．表示“一” There is a pen on the book.
2．第一次提到He saw a wallet lying on the ground.
3．泛指A boy can do it well.
4．表一类： A horse is useful.
5．惯用法in a hurry
6．其他用法 a better job,a nicest boya second timea hot Friday
7．不可数名词前有形容词修饰时： a big/heavy rain /snow;a big ．．suppera great succe有一些不可数名词加了形容词后仍不能加不定冠词（weathernewsfunadvice ,progre等）
8.用在姓名、作品前，表示“具有……特征的人”、“……的作品” egI wish to become an Edison.
They have a Picao in their living room.
用在带姓的名字前，表示一位姓。。。的小姐或先生
如：A Mi Chen came to see you this morning.
9.用在be +n+ of + a +n 的结构中表示不同事物的共同性。Birds of a feather, cars of a kind
二．下列情况只能用“the”
1．第二次提到Yesterday I saw a film.The film is directed by Zhang Yimou
2．表特指Where have you put the key?
3．最高级但 a strongest boy
4．序数级（单独用）the first, the last但又一次：如a second
5．有后置定语修饰时（含从句）the science of life;the boy in the roomthe balance of nature
6．独一无二的事物前the sunthe earth但 a rising sun;．
a pale moon， in societyin naturein space ．
7．表一类与一种的④相同。The horse is useful.horses
8．乐器前the pianothe violin
9．固定搭配in the morningthe momentthe minute
10．表示一类人的形容词前the rich/poor/injured/wounded
11．表一家人the Smiths
12．由普通名词组成的专有名词前The People’s Republic of China
13．沙漠、河流与群山，组织、党派和机关，书名杂志及报刊，定冠词不能删
the Tongting Lake ( Lake Tongting ), the United States, the Times
14．有后置定语修饰的地名/人名前加the(专有名词转化为普通名
词)
the China/the Shaoxing of the twentieth century/ He is the Newton
of the age.
15.对两人或两物进行比较时，起特定作用的比较级前
eg He isthe taller of the two children.
16.在发明物的单数前the compa
17.及物动词+宾语+介词+the+ 身体的部位catch him by the arm
18.用在历史朝代前the Song Dynasty
19.在以sh/ch/ese/结尾的表示国家和民族的形容词前the，表示这个国家和民族的全体人员。the French
20.与表示计量单位的名词连用，含有“每” by the dozen/hour/ pound
三．下列情况既不用a 也不用the
1．季节前，月份,星期，节假日前，in spring 但in the spring of 1989, ．
in the year 2000
2．表一类，Horses are useful.
3．棋类，球类play Chinese che
4．三餐前但 a rich lunch ．
5．固定搭配at once
6．学科前English但 the English language ．
7．抽象名词前但 the balance of naturethe science of life ．
8．官衔，军衔前 但 Smith, th9．Turn 动词后， turn doctor
10.as/though 前移的让步状语从句中。
11．在语言的名词前如：English但 the English language
12．在表示职位、职称、头衔的名词前
Mr.Cook has been elected headmaster of the school.
练习：
1.Suzhou is compared to ______ Venice of China.
A./B.aC.anD.the
2.Yesterday was ______ Children’s Day.
A.aB.anC./D.the
3.Which do you think is ______ of the two, Canada, or the USA?
A.largerB.the largerC.largestD.the largest
4.She said there was no ______ thing.
A.such aB.suchC.a suchD.so a
5.Tom owns ______ larger collection of ______ books than any other student in our cla.
A.the; /B.a; /C.a; theD./; the
6.The most important thing about cotton in history is ______ part that it played in ______ Industrial Revolution.
A./;/B.the; /C.the; theD.a; the
7.The wilsons live in ______ A-shaped house near the coast.It is ______ 17th century cottage.
A.the; /B.an; theC./; theD.an; a
8.For a long time they walked without saying ______ word.Tim was the first to break ______ silence.
A.the; aB.a; theC.a; /D.the; /
9.It is ______ world of wonders, ______ world where anything can happen.
A.a; theB.a; aC.the; aD./; /
10.______ on-going division between English-speaking Canadians and French-speaking Canadians is ______ major concern of country.
A.The; /B.The; aC.An; theD.An; /
11.--- The news that he has been admitted to Beijing University is spreading from mouth to mouth.
--- Yes, it’s become ______ talk of ______ town.
A.a; aB.the; /C.the; theD.a; /
12.If you buy more than ten, they knock 20 pence off ______.
A.a priceB.priceC.the priceD.prices
13.While he was investigating ways to improve the telescope, Newton made ______ discovery which completely changed ______ man’s understanding of color.
A.a; /B.a; theC./; theD.the; a
14.When you finish reading the book, you will have ______ better understanding of ______ life.
A.a; theB.the; aC./; theD.a; /
15.Many ______ astronaut wants to be ______ second Yang Liwei.
A.a; theB.an; aC./; aD.a; a
16.Do you know ______ art in the 18th century played ______ more important part in people’s lives than it does today?
A.an; theB./; aC.the; aD.the; the
17.Do you know ______ speaker of ______ Chinese language also has difficulty in learning Japanese?
A.the; theB.a; theC./; the
D.the; /
