If it rains......., if a student gets a bad mark....., If there is a power cut......, If you don’t eat breakfast....., if your phone battery gets low......, If students talk too much in class......., If you don’t sleep good....., If your friend feels sad....., If you mix red and blue paint......, If you miss the bus......, If you leave food outside in summer........, If you cold in winter.......

Zero conditional

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