1. If you turn off your computer every night, you ______ (save) energy.

2. If she ______ (not know) the answers, she will ask the teacher.

3. If he does all his chores, his parents ______ (be) pleased.

4. If we ______ (not look after) the planet, many animals will die.

5. If you don’t hurry, you ______ (miss) the forest clean-up.

6. If an animal ______ (eat) plastic, it will get ill.

7. If they have a lot of work, they ______ (not have) a break.

1. I’ll go to the supermarket if / when this programme finishes.

8. If they ______ (cut down) trees, the birds will lose their homes.

2. If she knew / knows more people, she’ll be happier.

3. We couldn’t / aren’t able to see anything because it is really dark.

4. You ’ll look / ’d look better if your hair is shorter.

5. They were able to / can call for help when they get a phone signal.

6. I’ll call you if / when I arrive home.

7. If he studied / studies harder, he’ll get better marks.

8. We couldn’t / can’t hear the teacher because the room is too noisy.