Articles "a" and "an"

ARTICLES
'a', 'an'
      
       'a'

• used before nouns which begin with a consonant sound and the 'u' sound

     e.g.    a bus
            a papaya
            a university
            a European



      'an'

• used before nouns which begins with a vowel sound or the silent 'h' sound

     e.g.       an aeroplane
               an ostrich
               an umbrella
               an honest man
               an hour