Answer:
your mom just kidding I think it is sorrowful
Cannot is formal, while can't in informal.
"Cannot" and "can not" are interchangeable, but when you are asking question for example:
"why can't I...", you can also say "why can I not..." (which is more formal), but you can't say "why cannot I..."
What place are you trying to round it to?
My guess is grotesque, hope this helps
