PLS HELP TO FIND OUT 1 MISTAKE

A OLD MAN FELL ASLEEP UNDER THE TREE. (wrong)
AN OLD MAN FELL ASLEEP UNDER THE TREE. (right)

Use AN instead of A.

Reasons:
1- Use AN before the vowels (a, e, i, o, u)
2- Use A before the consonants (b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, y, z)

AN OLD MAN FELL ASLEEP UNDER THE TREE.

2008-03-06 00:08:18 補充：
在有a,e,i,o,u 響音字前的 a 要改用an,如:

an egg, an orange, an umbrella, an onion, an apple, an old man......

change the a to an = =

2008-03-10 00:55:05 補充：
ok so officially im the 1st one to answer the question and if our answers are the same, i reli dont see why you guys still bother to type (your) answer here...