If you leave ice in the sun, ______, it will melt., it has melted., it melted., it melts., If you heat water to 100 degrees Celsius, ______, it will boil., it boiled., it boils., it has boiled., If you eat too much sugar, ______, you gain weight., you will gain weight., you have gained weight., you gained weight., If you exercise regularly, ______, your muscles became stronger., your muscles become stronger., your muscles will become stronger., your muscles have become stronger., ______ you get purple., If you mix red and blue, If you have mixed red and blue,, If you mix red and blue,, If you mixed red and blue,, ______ it breaks., If you drop a glass on the floor,, If you drop a glass on the floor, If you dropped a glass on the floor,, If you have dropped a glass on the floor,, ______ you feel tired the next day., If you didn't sleep enough,, If you don't sleep enough, If you haven't slept enough,, If you don't sleep enough,, ______ you make progress., If you studied a little every day,, If you study a little every day, If you study a little every day,, If you have studied a little every day,

Form1: Zero Conditional

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