Practice how to use "would have" (would've--commonly misspelled would of because of the way it sounds-- woulda) in sentences.This is a speaking and listening practice exercises. If you want to know what would have means or how to use would have, find the grammar lesson called "would have, could have, should have" and review it first, then return to this practice exercise. Here is a link to a transcript of this exercise
http://www.improveenglishesl.com/intermediate_would_have_wouldve_would_of_woulda_practice.html
Find the practice exercises for could have and would have and practice those too!