Would have pp

1. used to express the past consequence of an unrealistic action or situation in the past.

• If I had had enough money, I would have bought a car. (but I didn't have enough money, so I didn't buy a car.)

 

 

 

2. used to talk about something you wanted to do but didn't. This is very similar to the third conditional, but we don't need an 'if clause'

• I would have gone to the party, but I was really busy. (= I wanted to go to the party, but I didn't because I was busy. If I hadn't been so busy, I would have gone to the party.)
• I would have called you, but I didn't know your number. (= I wanted to call you but I didn't know your number, so I didn't call you.)
• A: Nobody volunteered to help us with the fair. B: I would have helped you. I didn't know you needed help. (= If I had known that you needed help, I would have helped you.)