I suppose there are some contexts in which they're interchangeable, but clearly they aren't in every context.
--- "So, when you are on FACEBOOK 'networking' with all your FRIENDS, what you are really networking with is a bunch of ELECTRONS that could care less about you or your existence."
#003 | willis5225 | Fri 10 Jan 2014 @ 12:12:40 AM (UTC)
I do. But I don't feel great about it. --- Willis, it seems like every other time you post, I need to look up a word that's in the OED or Urban Dictionary but not both. -Mimir
#004 | Kylo Force | Fri 10 Jan 2014 @ 1:39:06 AM (UTC)
Okay, I'll bite. Is one creating a conditional statement and the other not? I sat here thinking about this for about 2 minutes trying to come up with a really solid distinction in my head. --- http://img.photobucket.com/albums/v129/ukealii50/kylo.jpg - Thanks uke! http://img193.imageshack.us/img193/829/07kyloforce.png - Thanks Diyosa!
#005 | HeyDude | Fri 10 Jan 2014 @ 2:12:41 AM (UTC)
Yep. If is for if-then. Whether is for this or that.
I'll tell you if I'm coming to the party means that you will hear from me IF I am coming and implies that if I don't come you won't hear from me. If and only if, would explicitly say that.
I'll tell you whether I'm coming to the party means that I'll tell you which one I chose.
Rule of thumb: if always sounds like it'll be OK and whether sounds weird when you use it wrong. So mentally try whether first and if it doesn't work, use if.