1. if he is not busy, he does come.
2. if the grill studied well last year, she didn't receive bad marks.
3. if he didn't brake bicycle, he went to the country.
4. if he doesn't speak english badly: he has practice.
5. if I hadn't a bad headache yesterday, I came to see you.
6. if the ship wasn't sailing near the coast, it's not struck a rock.
7. if he was in town, he was present at our meeting.
8. if pavement wasn't so slippery, I didn't fall and didn't hurt my leg.
9. if the sea isn't rough, we can sail to the island.
10. if they didn't made a fire, the frightened wolves didn't run away.