Answer:
2.1. Told
2.2. Ate
2.3. Left
2.4. Bought
2.5. Would I have known
3.1. Must have ate
3.2. Should have known
3.3. Must help
3.4. Can't see
3.5. Weren't supposed to start
3.6. Must tell
3.7. Didn't need to go
3.8. Ought to have informed
