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