#1 is said to be theoretical possibility because of the word "Anybody." No one in specific is named as the subject.
#2 is present tense and means we are able to (but don't have to) go to the concert.
#3 is more of a possibility, especially when we are trying to decide what to do for the evening!
1. Anybody can make mistakes.
2. We can go to the concert.
3. We could go to the concert.
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In a grammar book, it is said that 'can' in #1 is used as theoretical possiblilty' Is that right? In #3, 'could' is used as 'present possibility.' What about 'can' in #2? Which one is the surer of the two.[#2 and #3] Does #2 have more possibility or does #3 have more possibility?
Can 'can' have both 'theoretical possibility' and 'present possibility'? What is the root of the terms of 'theoretical possibility' and 'present possibility'?
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