III conditional:
IF + past perfect, would (should/could itd.) have + past participle (3 forma czas.)
1. had eaten, wouldn't have needed.
2. would have gone, had been
3. had seen, would have chatted
4. had known, would have waited
5. wouldn't have gone, had checked
6. would you have gotten, had missed
7. wouldn't have watched, hadn't read