This language differentiates front-rounded from back-rounded vowels, as in vu, "seen" & vous, "you"
How do I control my... [DOC] [TLE] Common Errors in English Usage by Paul Brians - Washington State ... [PAR] Speakers of other languages tend to make some specific errors that are .... A/AN 
If the word following begins with a vowel sound, the word you want is "an": "Have 
...... store until you're sure you haven't just been invited to ride on a merry-go-
round.