How to know when you need to use “A” – "An" - and “The”.

*We use article “a” before nouns or adjectives. It goes before a singular noun that starts with a consonant. It ONLY describes a singular nouns.

Ex: a car

      a red pen

      a university *exception

*We use article “An” before nouns or adjectives. It goes before a singular noun that stars with a vowel  or when the H is silent.

Ex: an apple

      an interesting booklet

      an hour

*We use “the” before nouns or adjectives. It goes before singular or plural nouns or adjectives that describe nouns.

Ex:  the school

       the pink sweater

       the women

Here are links for practice

http://spot.pcc.edu/map/prev/aansome.htm

https://owl.english.purdue.edu/owl/resource/540/01/

http://www.edufind.com/english-grammar/definite-article/