Oddbean new post about login | logout Oh thank you for your help. I wonder if it's a common mistake. Similiarly, I get confused about which (a) and (an) to be using, when it is usually like this problem.
A, before a consonant sound at the beginning of the word: a house, for example. An, before a vowel sound at the beginning of the word: an artist, for example. Words like hour and honest have a silent H in the beginning, so use the an.