Первое:
1. knows/will try
2. returns/will watch
3. was
Второе:
1. would go
2. hadn't missed
3. were
4. had been
5. wasn't/would continue
6. had/wold've worked
7. could
Третье:
1. I wish it was summer
2. She could've helped us if she had been in town
3. If I were you I would learn this rule
4. She would've helped us if she was in town