1. If he___( to polute) water, he___(to do harm) to the environment.
2. Our streets______ (to be clean) if you_____( not to litter).
3. If Bob and Bill____(to clean up) after picnics together with their friends, Ann____(to invite) them to the party next Friday.
4. Kate ____(to meet) you, if I____(to be) here tomorrow.
5. If people______(to stop) throwing rubbish into the local river, clean water____(not to be) a problem in this town.
6. They_____(to visit) London Eye if she____(to come) to London next week.
7.I____( not to buy) a souvenir if the shop_____(to be) closed next Wednesday.
8. Animals _____(not to be) in danger if we_____(not to cut down) the trees.
9. You_____( to be) healthy if you____(not to eat) junk food.
10. If I ____ ( to see) Jack tomorrow, I _____( to tell) him about it.
11. They ____(to pass) the exam if they_____(to work) hard.
If the sky _______________ (be) red in the morning, it _______________ (rain) later that day.
If the weather (not improve) , we (not go) for a walk.
If she (not/go) to bed early, she (not wake up) in time.
If factories_____________so much plastic, there __________ less rubbish.
Many species _____ (disappear) if we ______(not protect) endangered animals and plants.
You_____( to be) healthy if you____(not to eat) junk food.
If we ______ (to recycle) papers we ______ (to save) many trees.
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