(Something is possible or someone has the ability.)
You can see the main gate if you look ahead.
Can you speak German?
Are you able to speak German? can able to ( can is more usual)
I can’t go to office early tomorrow.
(request)
Can you do me a favour?
(To ask for something)
Can I have your umbrella, please?
Can I speak to Suzy please?
(to give permission)
You can eat one more if you like.
(allowed or not allowed)
You can’t smoke here.
You can’t park here.
You can drink beverages as you work.
(Offer)
Can I get you a cup of tea?
Can I help you Mr Grandfather?
Can’t to say that we think something is impossible.
You’ve just had four hamburgers, you can’t be hungry.
Suzy sad that she would be here in time. She is 20 minute late, he can’t be coming
For the past can’t have
Suzy passed the examination. She didn’t study at all. The exam can’t have been very difficult.
