[JPRempe]

Originally Posted by BretMan

I can not...errr...cannot...ummm...can't find evidence to fully support that!

http://dictionary.reference.com/browse/cannot

The simple rule is that if you have to use an apostrophe (can't, won't, shouldn't), it should be spelled as two words if you actually choose not to use the contraction version. I don't know why cannot is accepted when donot or willnot is not. See what I'm talking about there?