We can use can and can't to talk about abilities in the present. We use can to say that something is possible or allowed, or that somebody has the ability to do something.
• I can swim.
• They can speak English.
• He can't sleep.
How to use 'can' and 'can't'
- We use can + infinitive (for example: can do / can see etc.).
• We can see the lake from our hotel.
• Can you speak English?
• We can come and see you tomorrow if you like?
- The negative form of can is can’t (= cannot).
• I’m afraid I can’t come to the party on Friday.