can

• and could see can and could 1: introduction- see adverb position 5: emphasising adverbs
• ability see can and could 2: ability
• can!could always see can and could 3: ability advanced points.4
• can!could and may/might see may and might 8: may/might and can/could
•
• can have done
in questions see must 2: deduction concluding that something is certain.4
• can or will be able see can and could 3: ability advanced points.1
•
• can see, hear
etc see can and could 5: with see, hear, etc
• can speak, play
•
see can and could 3: ability advanced points.3
• can’t and may/might not see may and might 2: chances etc.4
• can’t and mustn’t see must 2: deduction concluding that something is certain.2
• can’t have done see must 2: deduction concluding that something is certain.4
• could and was able to etc see can and could 2: ability.5 , see can and could 3: ability advanced points.2
• could and was allowed to etc see can and could 4: interpersonal uses permission, requests etc.3
• could as a less definite form of can see can and could 2: ability.6
• could have done see can and could 2: ability.7 , see can and could 3: ability advanced points.5 , see if 4: unreal past situations.2
• could in indirect speech see indirect speech 2: tenses.3 , see indirect speech 5: advanced points.3
• could meaning ‘would be able to’ see can and could 2: ability.6,
• see if 3: special structures with past tenses and would.6
• could meaning ‘would be allowed to’ see can and could 4: interpersonal uses permission, requests etc.4
• could making questions etc less direct see politeness 2: distancing verb forms.4
• interpersonal uses (permission, requests, offers, suggestions, criticisms etc) see can and could 4: interpersonal uses permission, requests etc
• weak and strong form see weak and strong forms.3

For more information consult a good dictionary like Langman, Oxford, Merriam Webster, or Collins.