Relier Pairs zero conditionalVersion en ligne The zero conditional is often used to refer to general truths. The tense in both parts of the sentence is the simple present. par Silvia Yumbillo 1 If my dog sees the postman 2 If you don't put sun cream on, 3 If water reaches 100ºC, 4 If you heat ice, 5 If you feel sick, It barks. you get burnt. it melts go to the doctor it boils.