If they _ (not clean) their room, it _ (be) messy.
If he _ (not exercise), he _ (not be) healthy.
If he _ (not study), he _ (fail) the test.
If she _ (not like) the movie, she _ (leave) early.
If we _ (not hurry), we _ (miss) the bus.
If they _ (touch) a flame, it _ (burn).
If you _ (heat) ice, it _ (melt).
If you _ (freeze) water, it _ (turn) into ice.
If she _ (not water) the plants, they _ (die).
If it _ (rain), the ground _ (get) wet.
What _ (happen) if you _ (mix) yellow and blue?
If the sun _ (set), it _ (become) dark.
What _ (happen) if you _ (not water) the flowers?
If you _ (eat) too much candy, you _ (get) a stomachache.
If they _ (play) outside, they _ (get) dirty.
When you l___ (listen) and ____(participate) in the lesson, you ---- (learn) better.
If I _ (not eat), I _ (feel) hungry.
If the clock _ (strike) midnight, it _ (be) a new day.
If we _ (turn) off the lights, the room _ (get) dark.
If he _ (not wear) a coat, he _ (feel) cold.