The term “would of” is an incorrect grammatical combination. It results as a result as the incorrect pronunciation of “would have.” Many describe “would of” and “would have” to sound similar. The word “would” is a modal auxiliary verb used to refer to the future or point at a past event.
The correct expression is “would have.” This expression describes what a person will do if they had the chance but cannot do so because the event is now in the past. An example of this: “I would have passed the exam if I had studied harder.”
“Would of” cannot be used because the word “would” is a modal. This means that you can only use the word “would” if you are going to provide judgment or if you are promising that you are going to do something in the future.
The only reason why “would of” and “would have” are often compared to each other is they sound alike. Most people are just using “would have.” which means that if you were given a chance, you could have done it, but it is too late now. For example, “I would have helped her if I was in the area.”