1. You can go now.
2. You are able to go now.
3. You are allowed to go now.
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Does #1 mean #2 or #3?
If 'can' means 'ability,' #1 means #2.
However, if 'can' means 'permission,' #1 mean #3. Is that right?
All mean approximately the same thing, but 1 can be used as a dismissive command!
The verbs "can" and "able" mean the same thing. Technically, "may" is the verb needed for permission.