Ответ:
2. She had finished written letters, when her mother arrived
3. The child had cut his finger, we could take the knife from him
4. The rain had stopped, when we moved home
5. He had diceded to study French, before he left school
6. Sam had worked hard, he could get success
7. The house had been built, before tornado ruined it
8. My brother had received an email, before he wrote back
9. I bought a new dog, my old dog had died