What is the usage difference between "could have" and "would have".
com/dictionary/english/would
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See entry #3: https://www.collinsdictionary.com/dictionary/english/could
See entries #4 and #14: https://www.collinsdictionary.com/dictionary/english/would
You would have taken it says you were going to take it. That event was definitely going to happen if the proper conditions were fulfilled.
You could have taken it says you had the ability to take it, not that you were definitely going to take it.
CJ