How to use articles (A, An and The) ?

Articles are very important to build sentences in English, in English there are two types of articles.

1.  Indefinite article ( A and An )
2. Definite articles ( The)
                                                                   

Use of Indefinite Article A - A is used before  countable nouns start with consonants for example.

• He is a cricketer.
• She has a car.
• There is a window in the class.

Here cricketer, car and window start with consonants.

However,  if the  noun start  with vowels  but it sound like consonant still article a will be used, for instance.

• He is a European.  ( European sound like yuropean)
• She will study in a university. (Here university sounds like yuniversity). 

Use of Indefinite Article An - An is used before  countable nouns start with vowels  for example. 

• I am an Indian.
• She is an American.
• They are Iranians.                     

Use of Definite Article The - Article The is used before the nouns we previously know, or unique thing in a specific concerns, the nouns may be countable or uncountable .

It can  be understood  by the examples.

1. Using before superlative degrees.

• Honesty is the best policy. ( Here no other policy is better than honesty).
• IIT is the best engineering institute of India.
• AIIMS is the best medical institute of India.