Video lesson · Can / Could / Be Able to
Theoretical Possibility with can refers to using can to express what is potentially possible or conceivable, rather than actual present ability. This form of can expresses general possibility or potential occurrence rather than someone's specific ability to do something.
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Can / Could
Be Able to
Present and Future Ability
Skills
Unusual Ability
With Verbs of Senses
Permission / Prohibition
Requests
Offers
Deduction / Negative
Present Use / Summary
Possibility / Ability in the Past
Permission / Prohibition in the Past
With Verbs of Senses / Past
Past Skills
Possibility / Ability in the Past + Fact 
Past Use / Summary
Ability in the FutureGet the app and practice this topic as a game — with XP, streaks and instant feedback.
