The entire sentence sounds very ackward to me, but to answer your specific question, I can think up a sentence where this form would be correct. "
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ConscientiousStudentplease tell me why it is "would have believed"?The if clause is implicit.
renan torres-riveroCan you give us some examples of what you said above?
"Is it true they would have killed him?"
"I would have come, but I was too busy."
"In a properly designed product this would never happen."renan torres-rivero I understand from what you mentioned that "would have done"