1. If Williamа (sleep) better at night, he а (start) his day with more energy.
2. If he а а(not/be) ill so often, he а(not/miss) so many classes.
3. If you (not/drink) so much coffee, you (sleep) better.
4. How you (feel) if you (be) the only person on Earth?
5. If I (have) longer summer holidays, I (travel) more