1. The indefinite article – a
The indefinite
article a is the same for all genders.
·        
a boy
·        
a girl
·        
a cat
The indefinite article
has no plural form.
·        
a boy → boys
We use an if
the following word starts with a spoken vowel.
| 
the following word starts with a spoken consonant | 
the following word starts with a spoken vowel | 
| 
·        
  a boy 
·        
  a school 
·        
  a girl | 
·        
  an aunt 
·        
  an old school 
·        
  an American girl | 
| 
Mind the pronunciation of the following
  word. | |
| 
The first sound we speak is [j],
  so we use a → a unit | 
The first sound we speak is [ʌ],
  so we use an → an uncle | 
2. Use of
the indefinite article a/an
2.1.
before phrases of time and measurements (per week/weekly)
·        
We have English 4
times a week.
·        
I go on holiday twice a year.
·        
Our car can do 220
kilometres an hour.
·        
Tomatoes are $2 a kilo.
2.2.
before phrases of jobs
·        
My father is a car
mechanic.
2.3. with
a noun complement
·        
He is a good
boy.
2.4.
before phrases of nationality
·        
Bruce Springsteen is an American.
2.5. half/quite
·        
We need half a pound of
sugar.
·        
This is quite a good
story.

 
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