Thank you for checking my question.
What is the difference between “could” and “can” in the following cases?
Which word emphasizes the speaker’s feeling more?
Case 1: Someone said something rude.
How could you say that!
How can you say that!
Case 2: Someone is knocking the door.
Who could that be?
Who can that be?
Littleshiro Which word emphasizes the speaker’s feeling more? ) CJ
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LittleshiroWhich word emphasizes the speaker’s feeling more?
could
(The versions of your sentences with 'can' are more neutral in emotional tone.)
CJ