Rule 1: A / An / The + Noun :-

• I have a book.
• He has an umbrella.
• The cow has a tail.

Rule 2: A / An / The + Adjective + Noun :-

• She is an intelligent girl.
• Monika has a long stick.
• Tendulkar is the best player.

Rule 3: A / An / The + Adverb + Adjective + Noun

• She is a very intelligent girl.
• He is the very best player.

Rule 4: Such / What / Many / Rather / Half / + A / An + Noun

• Such a girl.
• Waht a fool.
• Many an inkpot.
• Rather an idea.
• Half an hour.
• Half a kilo.
• Many a book.

Rule 5: Such / What / Many / Quite / Rather + A / An + Adjective + Noun.

• Such a beautiful girl.
• What a big fool ?
• Many a good book.
• Quite an unlucky man.
• Rather an interesting book.

Rule 6: How / So / Too / As + Adjective + A / An + Noun.

• How beautiful a girl is she?
• How beautiful a girl she is!
• Devan Babu is too weak a man.