I can contract my sentence when I contradict a statement or reply to a question.
A: I would not trust him.
B: I would. ( I would trust him.)
But in the following sentence, must it always be “would have”, with have? How often are B1 and B2 used?
A: If he had asked me that, I would not have answered him.
B1: I would have.
B2: I would.