If you press this button - the machine starts., If you heat water to 100°C - it boils., If it doesn't rain - the grass doesn't grow., 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., If you don't leave now - you'll be late., If it rains tomorrow - I'll stay at home., If they win - they'll get a big prize., If she doesn't pay attention - she won't understand.,

Zero & First Conditional

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