Cannot.
Not seeing how this has much at all to do with contractions.wtf how is this even a question?
think i learned this in like 3rd grade when i learned contractions.
cannot.
can't
cantnotdonedoit
I would use cannot. I would also use who rather than that.
CANNOT/CAN NOT
These two spellings are largely interchangeable, but by far the more common is “cannot” and you should probably use it except when you want to be emphatic: “No, you can not wash the dog in the Maytag.”
http://public.wsu.edu/~brians/errors/cannot.html
CANNOT/CAN NOT
These two spellings are largely interchangeable, but by far the more common is cannot and you should probably use it except when you want to be emphatic: No, you can not wash the dog in the Maytag.