Video lesson · Can / Could / Be Able to
Past Possibility/Ability with could refers to using could to express what someone was generally capable of doing or what was possible in the past. This form indicates that the ability or possibility existed in the past, whether or not it was actually used or occurred in specific instances.
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Can / Could
Be Able to
Present and Future Ability
Skills
Unusual Ability
With Verbs of Senses
Theoretical Possibility
Permission / Prohibition
Requests
Offers
Deduction / Negative
Present Use / Summary
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.
