a : 一件物件或一個人物  eg. Alice 
works in a bank.
an : ( 不是 a;) 用於以 a / e / i / o / u 為開首的字前
eg. Do you want an apple or a banana?
* 注意 : an用在所有noun的開始是非打開口的音節。例如an egg, an orange等,還可以用在的an X-ray film, an hour等雖然不是a,e,i,o,u開始,但是開口發音的音節。相反,即使是a,e,i,o,u開始,但非打開口發音的noun, 例如university, umbrella,都不能an。a則用在非an的情況。
an hour h 是不發音的 : an ( h ) our
a university ( 發音為 yuniversity )
a European country ( 發音為 yuropean )
another ( = an + other ) 是一個字 eg. Can I have another cup of tea?
a / an : 用於說明某事物或某人物 eg. The sun is a star.
a / an : 用於表示工作等等 eg. Would you like to be a teacher?
an : ( 不是 a;) 用於以 a / e / i / o / u 為開首的字前
eg. Do you want an apple or a banana?
* 注意 : an用在所有noun的開始是非打開口的音節。例如an egg, an orange等,還可以用在的an X-ray film, an hour等雖然不是a,e,i,o,u開始,但是開口發音的音節。相反,即使是a,e,i,o,u開始,但非打開口發音的noun, 例如university, umbrella,都不能an。a則用在非an的情況。
an hour h 是不發音的 : an ( h ) our
a university ( 發音為 yuniversity )
a European country ( 發音為 yuropean )
another ( = an + other ) 是一個字 eg. Can I have another cup of tea?
a / an : 用於說明某事物或某人物 eg. The sun is a star.
a / an : 用於表示工作等等 eg. Would you like to be a teacher?
the : 用於特別指明某物件或某人物 , 而談話中的雙方都知道所指的是甚麼
eg. Turn off the light and close the door. ( = 那房間的燈和門 )
* 注意 : 別忘記加上 the :
Do you live near the city centre? ( 不是 near city centre ;)
the same eg. We live in the same street. ( 不是 in same street ;)
在下列情況必須用 the :
the sun / the moon / the world / the sky / the sea / the country :
eg. the sky is blue and the sun is shining.
( 一個城市或國家的 ) the police / the fire brigade / the army :
eg. My brother is a soldier. He is in the army.
the top / the end / the middle / the left 等等 : eg. Write your name at the top of the page.
( play ) the piano / the guitar / the trumpet 等等 ( 樂器 ) eg. Paula is learning to play the piano.
the radio : eg. I listen to the radio a lot.
在下列情況切勿用 the :
television: eg. I watch television a lot. 但 ... Can you turn off the television ? ( = the TV set )
breakfast / lunch / dinner : eg. What did you have for breakfast ?
next / last + week / month / year / summer / Monday 等等 :
eg. I am not working next week.
eg. Turn off the light and close the door. ( = 那房間的燈和門 )
* 注意 : 別忘記加上 the :
Do you live near the city centre? ( 不是 near city centre ;)
the same eg. We live in the same street. ( 不是 in same street ;)
在下列情況必須用 the :
the sun / the moon / the world / the sky / the sea / the country :
eg. the sky is blue and the sun is shining.
( 一個城市或國家的 ) the police / the fire brigade / the army :
eg. My brother is a soldier. He is in the army.
the top / the end / the middle / the left 等等 : eg. Write your name at the top of the page.
( play ) the piano / the guitar / the trumpet 等等 ( 樂器 ) eg. Paula is learning to play the piano.
the radio : eg. I listen to the radio a lot.
在下列情況切勿用 the :
television: eg. I watch television a lot. 但 ... Can you turn off the television ? ( = the TV set )
breakfast / lunch / dinner : eg. What did you have for breakfast ?
next / last + week / month / year / summer / Monday 等等 :
eg. I am not working next week.
Exercise
Fill in the blanks with 
‘a’, ‘an’, ‘the’ or ‘x’
(1) 
Every policeman has    
uniform.
(2)   
I 
have   T-shirt.
(3)   
He  left   
hour 
ago.
(4)    My mother is    honest woman.
(5)    Moon is in   sky.
(6)    I will go to the 
library on   Friday.
(7)    There is umbrella on   floor.
(8)    We will have    test tomorrow.
(9)    I have    dog called “Bo Bo”.    
(10)   We go to school by bus.
(11)    
There was an aeroplane high in   sky.
(12)    
Peter received     
award for good conduct in school.
(13)    
Her 
birthday is on   sixth of 
August.
(14)    
May 
lives on  second 
floor.
(15)    
Ben 
won the race. He was    
first.
(16)    
Tea 
is    best drink for hot 
weather. 
(17)    
He 
uses   axe to cut    tree.
(18)    
  apple day keeps the doctor 
away.
(19)    
Chinese is not    
easy language.
(20)    
He 
wishes to study in university in 
the future.
(21)    
  hour ago, I saw you 
running to school.
(22)    
Sun 
rises in   morning.
(23)    
She 
has failed in    examination 
three times.
(24)    
It 
is impossible for us to touch   
moon.
(25)    
They 
lost   anchor in   storm.
(26)    
We 
found   elephant in jungle.
(27)    
My 
brother studies in University of 
Hong Kong.
(28)    
She 
is    hard-working 
girl.
(29)    
  ship will set sail for 
Japan in   few days.
(30)    
What 
kind of    animal is 
that?
(31)    
I 
have   opportunity to go to New 
York.
(32)    
Please do me    
favour.
(33)    
  pencil-box is as 
expensive as book.
(34)    
Three days ago, Bobby broke 
vase.
(35)    
Yesterday Jack played with 
group of children
 in garden.
THE 
END
 http://www.happyandhealth.com.hk/english_exercise.htm
Answers
1. a 
2. a 3. 
an 4. 
an
5. the 
6. X 
 7. an, the 
8. a
9. a 
10.    X      
11.    the 
12.    an 
13.    the 
14.    the 
15.    the
16.    the 
17.    an, the 
18.    an, 
a
19.    an 
20.    a 
21.    an
22.    the 
23.    the 
24.    the
25.    an, the 
26.    an, the 
27.    the
28.    
a 
29.    the, a 
30.    
x
31.    
an 32.    
a 
33.    the, 
the
34.    the 
35.    a, 
the
 
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