Ответ:
1.If he leaves early, he will be
2. If I were you, I wouldn't go
3. If you give me a hand with the washing up, we can go
4. We will go surfing if it is sunny
5. What would you do if you lost your keys? / What will you do if you loose your keys?
6. The animals in the zoo will die unless they're fed
7. If the boys don't pay football, the girls will not come
8. The Smiths will go on holiday is they have time / The Smiths would go on holiday if they had time
9. If we go to McDonald's we will have more to eat
10. If I earned a lot of money I would move to Paris