Question

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Answer 1

2. wouldn't have bought, had known
3. had known, would have told
4. would've phoned, hadn't forgotten
5. would you have done, had found

Answer 2

2.I wouldn't have bought,if I had known

3.if I had known,would have told you

3.we would have phoned,if we hadn't forgotten

4.would you have done if had found out