The difference between "could have done" with "may/might have done"

could/may/might have happened = it was possible but didn't happen.

I don't think "may/might have happened = it was possible but didn't happen."

for example:

A: I was surprised that kate wasn't at the meeting yesterday. B: She might not have known about it.

A: I wonder why kate didn't answer the phone. B: She might have been asleep.

Is there any difference between "could have done" with "may/might have done"? Yes.

"You could have left your bag in the shop ( = you may/might have left it)" Yes. Two meanings.

1. You may/might have left it. / Maybe you left it.

Hi. Please help. I am not at all sure but I think it was you, CalifJim, who said "could" is synonymous with "may be able to." I am not also not at all sure as to the content or the person but I think it was you, CalifJim, who said something to the effect that we can use the word "could" in place of "may be able to" in sentences. Are these correct?

If he tries hard, he could mak

For what it's worth, these are still interchangeable in my book:

If he tries hard, he could make the list next week.

If he tries hard, he may be able to make the list next week.

If he tries hard, he might be able to make the list next week.

If he tries hard, he might make the list next week.

If he tries hard, he may make t

I think it was you, CalifJim, who said "could" is synonymous with "may be able to."

I may have said such a thing, and if I did, it was probably in reference to some specific sentences, because the two are not synonymous in general. He said that he could fly cannot, for example, be accurately paraphrased as He said that he m