Top Ten Grammar Myths
#4 applies to us-
You use a before words that start with consonants and an before words that start with vowels. Wrong! You use a before words that start with consonant sounds and an before words that start with vowel sounds. So, you'd write that someone has an NSX instead of a NSX, because even though MBA starts with m, which is a consonant, it starts with the sound of the vowel e--MBA.
#4 applies to us-
You use a before words that start with consonants and an before words that start with vowels. Wrong! You use a before words that start with consonant sounds and an before words that start with vowel sounds. So, you'd write that someone has an NSX instead of a NSX, because even though MBA starts with m, which is a consonant, it starts with the sound of the vowel e--MBA.