Is used in front of singular contable nouns(a person, animal or thing) which are not specific. We don´t use a before uncontable or plural nouns. If a noun starts with a consonant soun( b,c,d,f,g,h,j,k,etc.)
-We use in front of all nouns (it does not matter whether the nouns are singular, plural countable or uncountable) to describe someone or something specific or unique .
-Is used in fron of singular countable nouns which are not specific. -We don´t use a before uncontable or plural nouns. -If the nouns starts witch a vowel soun (a,e,i,o,u) comes before the noun.
An
The
A