Answer: The guest was in prison for 10 years and knew the importance of freedom. This story tells us that we should not lock up a living animal or harm them.
Explanation:
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..."
