1 Complete the zero conditional sentences with the correct form of the verbs in brackets. 1 If you (burn) coal, it (give) off greenhouse gases. 2 A rainbow often (appear) if the sun (come) out when it's raining. 3. If an earthquake (happen) under the ocean, it sometimes (cause) a tsunami. 4 Ifa hurricane (form) over the Indian Ocean, they (call) it a typhoon 5 If you (eat) ice, it (make) your body cold. 6 Floods (happen) if it (rain) a lot more than usual for a long time.
1. burn, gives
2. appears, comes
3. happens, causes
4. forms, call
5. eat, makes
6. happen, rains