" No; it is a statement about the past.
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park sang joonI'd like to know I can replace "could with "can."No; it is a statement about the past.
park sang joon1. You could just as well have apologized then and there. I'd like to know I can replace "could with "can."Note the combination "could" and auxiliary "have". That is the usual combination. "can have apologized" sounds wrong. It is amazing how little we use "can" with auxiliary "have". We very rarely combine those words. So no,
park sang joon2. You may/ might just as well apologize here and now.Then I'd like to know in #2 if I can replace "may/ might" with "can" or "could."No, not without changing what you're saying. The meaning with 'may' or 'might' is different.
park sang jooncould/might just as well do somethingHmm. I don't hear the version with "could".
park sang joonI was wondering in this case if I can't use "may" in lieu of "could/ might."Yes. That's commonly said. ... we may (just) as well ...