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Use "couldn've" in a sentence
"I wish I couldn've watched him put all his brut strength into opening that coconut, but I was in the kitchen effing up the cupcake batter."
"But somehow I wish I could've softened the blow, couldn've written something encouraging and personal to the students who didn't do as well as they (or I) had hoped."
"For all you know, the man who killed the other person, could have been unintentional, or he couldn've done something that had a great impact on the guy before he decided to kill him."