Exercise 1. Write the correct form of each verb in brackets. 1. If it (be) ____________________ sunny next week, we (plant) ____________________the vegetables. 2. If we (recycle) ____________________more, we (help) ____________________our Earth. 3. We (save) ____________________ a lot of trees if we (not waste) ____________________ so much paper. 4. More people (have) ____________________ fresh water if we only (use) ____________________ the water we need. 5. If the river (not be) ____________________ dirty, there (be) ____________________ more fish. 6. If the Earth (be) ____________________ warmer, the sea level (rise) ____________________. 7. If the sea level (rise) ____________________, some countries (disappear) ____________________. 8. If we (reduce) ____________________ soil pollution, we (have) ____________________ enough food to eat. 9. If we (not have) ____________________ enough food, we (be) ____________________ hungry. 10. If we (be) ____________________ hungry, we (be) ____________________ tired. Exercise 2. Combine each pair of sentences below to make a conditional sentence - type 1. 1. We pollute the air. We have breathing problems. ____________________________________________________________________________________________ 2. People pollute the water. A lot of fish die. ____________________________________________________________________________________________ 3. We cut down trees in the forest. There are more floods. ____________________________________________________________________________________________ 4. The soil is polluted. Plants die. ____________________________________________________________________________________________ 5. There is noise pollution. People and animals have hearing problems. ____________________________________________________________________________________________ Exercise 4: Choose the correct answer. 1. My dog ___ bark unless it is hungry. A. dont B. wont 2. Unless you ___ to go to bed early, we should go out. A. wants B. want 3. ___ you dont slow down, we are going to crash! A. If B. Unless 4. You cannot go into bars ___ you are over 18. A. If B. unless 5. In my country, ____ you cannot speak English, its hard to get a good job.A. if B. unless 6. Shell fail the exam if she ___ study. A. if B. doesnt 7. Well be late ____ we leave soon. A. if B. unless 8. ___ I am not feeling better tomorrow I will go to the doctors. A. Unless B. If 9. ____ you do not make the payment in time, your car will be confiscated.A. If B. Unless 10. You will lose your job ___ you change your attitude and become friendlier.A. unless B. If 11. She wont know the truth ___ you tell it to her.A. unless B. if 12. ____ you arrive early, youll be able to meet the customers before the meeting.A. Unless B. If 13. ____ she eats healthy food, she wont lose some weight.A. Unless B. If 14. They wont arrive on time ___ they finish the work early. A. unless B. if 15. Will she able to eat some cake ___ I put eggs in it? A. unless B. if