CAN CAN'T

CAN / CAN'T shows ability, inability, request, permission, possibility, and inappropriateness.

Examples:

a. I can speak English. (ability)
b. You can leave early today. (permission)
c. Can I come in, please? (asking for permission)

Formation:

Positive: Subject + CAN + Verb1  YOU CAN SWIM 

Negative: Subject + CAN'T + Verb1 HE CAN'T SWIM

Interrogative: CAN + Subject + Verb1  CAN YOU SWIM? 

Answers: 

Can you play the piano? Yes, I can
Can you play the violin? No, I can't

EXERCISES

Exercise1
Exercise2
Exercise3
Exercise4




ADAPTED FROM: 

https://www.grammarbank.com/can-cant-esl.html