Both can and could can mean both ability and possibility. Both could and do appear in your sentence, and with the same meaning. Just turn the key.
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johnerHere when we hear the "could " we only think of a general possibility, right?I'm trying to imagine what it means to think only of a general possibility, but it seems to me that you're on the right track.
johnerFrom time to time someone can hate being in public. ORThese are not natural. I don't know what you're attempting by using "from time to time" and "at times". It seems you're trying to show usual or characteristic behavior, but the
- What's wrong with John? He's acting like a fool.
- At times there's nothing worth watching on TV, he can act so.