1. If you_________ (eat) another cake, you_________ (be) sick.
2. You_________ (fail) your exam if you_________ (not/study) hard.
3. What _________ (you/do) if you_________ (fail)?
4. Our children and grandchildren_________(suffer) if we_________ (not/look after) our planet.
5. If you_________ (be) late, I_________ (go) without you.
6. If you_________ (need) help, my father_________ (help) you.
7. He_________ (lose) weight if he_________ (stop) eating too much.
8. If she_________ (be) patient, I _________(try) to explain.
9. I _________( (wear) a purple tie but only if I_________(must).
10. If we_________ (leave) at once, we_________ (catch) the early train.
11. If he_________ (do) that again, his father_________ (punish) him.
12. If she_________ (drink) this medicine, she_________ (feel) much better.