Indefinite Articles  – A  and  An.  A small description of Indefinite articles is given below:

(1)  ‘ A ‘ is used before a word beginning with a consonant –  a bag,  a house,  a girl  etc.

(2)  ‘ A ‘ is used before a word that begins with a vowel but pronounced that of ‘ Yu ‘ and  ‘ W ‘.

• a university , a union , a European,  a useful article
• a one rupee note,  a one-eyed dog etc

(3)  ‘ An ‘  is used before a word beginning with a vowel.

• an enemy,  an orange,  an apple etc

(4) ‘ An ‘ is used before consonants which are pronounced with vowel sounds.

• an hour,  an honest man,  an heir etc