Anonymous  +  913735 Wed, 23 Sep 09 12:30 AM What is the rule for the use of "a or an" when using this sentence:  My father is "a/an" M.D.  I never know what to use because M is not a vowel but it sounds like one.   I use "an" because it sounds better to me, to my knowledge, I've never heard a rule for this . Could you please give me some guidence on this? Thank you, M.K. Eastman Anonymous Articles, Vowels, Sentences

	Grammar Geek  +  913738 Wed, 23 Sep 09 12:34 AM Sure, there's a rule. The a/an decision is based on how it sounds, not what the letter is. An em-dee. Grammar Geek Joined on Tue, Jan 10 2006 Veteran Member 19,681 Barbara, who answers in American English. My housekeeping skills attest to the truth of the second law of thermodynamics: Left to themselves, things get more and more random! Articles, Vowels