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.
12. I ____(to be able) to understand you if you ____(to speak) slowly.
для контролю знань і залучення учнів
до активної роботи у класі та вдома