How do you know when to put an "an" instead of an "a" before a word that starts with "h"? For example, is this right?<br/><br/>"That was a harsh thing to say."<br/><br/>"That was an hilarious thing to say."<br/><br/>It sounds to me like in the second one, the "n" is needed, but not in the first.<br/><br/>Thanks.