Prepare 8. Zero and First Conditional (WB page 66)

Complete the zero conditional sentences using the correct form of the verbs in brackets in the correct order.

1. If Tom      your experiment work, he       happy. (feel, see)

2. If you      water, it       at 100 °C. (boil, heat)

3. I    always exhausted the next day if I    to bed very late. (be, go)

4. They       the schools in the United States if the temperature       -20 °C. (close, drop)

5. If my brother       under a ladder, he        he will have bad luck. (think, walk)

6. My sister        her science classes if she       in a group with her friends. (work, enjoy)

Complete the text with the correct form of the verbs in the box.

There is a hole in Tom's roof. When it rains, the water       in. When the water comes in, it       the floor wet. When the floor is wet, the walls        green. When the walls are green, Tom         ill. When he is ill, the man      to the doctor. When Tom sees the doctor, the latter always      the same thing: 'Fix the roof!'

Match the sentence halves.