1. If spring comes, the snow melts.
2. If you add 3 and 5, you get 8.
3. If he heats ice, it turns to water.
4. If you play with fire, you get burned.
5. If the sun goes down, it gets dark.
6. If you take an aspirin, you feel better.
7. If I mix blue and red, I get purple.
8. If you press this button, the machine stops working.
9. If I drop a glass on the floor, it breaks into pieces.
10. If you drink poison, you are very likely to die.
11. If he goes by air, he must have with him a passport.
12. If you take things seriously, they matter.
13. If he puts something on top of it, it disbalances it.
14. If you stand in the rain, you get wet.
15. If she is sick, call a doctor.
P.S.
1. If you sell the cow, you sell her milk too.
2. If you take off your head you don't weep for your hair.