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Using can for ability
SubjectModal VerbBase form.
I / Youcan / can't
could / couldn't
singwell.
He / She / It
We / You / They
Modal VerbBase form
Can yousingwell?
Use can to talk abilities you learn: I can ride a bicycle.
The modal verb can has the same form all persons: I can, she can, etc.
Questions and the negative are formed without do.
Yo can also use know how to talk about learned abilities but not for non-learned abilities: I can't see without my glasses.  ̶I̶ ̶d̶o̶n̶'̶t̶ ̶k̶n̶o̶w̶ ̶h̶o̶w̶ ̶t̶o̶ ̶s̶e̶e̶ ̶w̶i̶t̶h̶o̶u̶t̶ ̶m̶y̶ ̶g̶l̶a̶s̶s̶e̶s̶.̶