should have V3 (it was the right thing to do, but didn't happen; regret or advice), shouldn't have V3 (it was a mistake; it would have been better not to do it), could have V3 (it was possible or there was an opportunity, but it didn't happen), can't have V3 (I'm sure something did NOT happen; impossible), couldn't have V3 (it was impossible or there was no opportunity to do it), must have V3 (I'm almost certain this happened; logical conclusion), might have V3 (perhaps this happened; it's possible but I'm not sure)

ghg

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