used to say someone is not able to do something
I cannot swim, so I always wear a life jacket on the boat.
She cannot see the small print without her glasses.
used to say something is not allowed by a rule or authority
You cannot park here; it's a fire lane.
Students cannot use their phones during the exam.
used to say that something is impossible or definitely not true
It cannot be midnight already; we just arrived!
That story cannot be real.
