a)

2. I would buy a huge house if I won the lottery.

3. If you painted this room white it would be much lighter.

4. I would do it myself if I had more time.

5. I wouldn't be so broke if I spent so much on going out.

6. Maybe if I shared a flat with friends, I would get on better with my parents.

7. I would travel next summer if I had more money.

8. Carla would move out out of her shared flat if she found a job.

9. If my girlfriend wouldn't have to work so hard, we could see each other more often.

10. If I went to bed earlier, I wouldn't be so tired all the time.

b)

2. would buy

3. goes

4. reduce

5. would take

6. gets

7. wouldn't be

8. found

9. will never finish

10. will be