When should I use "would have to have + verb" and when "would have had to + verb", I assume the second one is a part of third conditional. but when should I use the first one ?
e.g. in these two sentences
He would have had to help me first. (or " I would have had to be helped by him first.")
He would have to have helped me. (or "I would have to have been helped by him.")
Is the second one referring to second conditional? If yes, then how different is its meaning from "He would have to help me" ?