Indifine article
The article "the" is used before singular nouns. The common nouns which start by consonants take the article a before them. The consonants are : b, c, d, f, g, h, j, k, I, n, p, q, r, s, t, v, w, x, y, z.
Common nouns with the article a:
A kite; A boy; A book; A tree; A car; A pen.
Common nouns with adjectives and the article a:
A black elephant; A boiled egg; A white African; A military escort; A yellow banana.
The common nouns which start by a vowel take the article an before them.
Here are the vowels: a, e, i, o, u.
An animal; An orange; An elephant; An ant; An ox.
Common nouns with adjectives and the article " an"
An old book; An ugly boy; An empty tin; An early come.
However, it is misleading to assert that the article an is always used when the next word starts with the vowel because of exceptions found in the examples here below:
A European; A one way-street; An hour; An x-ray; A university; A united country; An honest man.