If you press this button, the machine starts., If you heat water to 100°C, it boils., If it rains, the garden gets wet., If you heat ice, it melts., If you mix red and blue, you get purple., If you eat a lot of chocolate, you won't feel well., You will be late, if you don't leave now., If it rains tomorrow, I will stay at home., They will get a big prize, if they win., If she doesn't pay attention, she won't understand..

zero and first conditional

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