If we do bad things to the world, it will be a bad place., If the sun gets hotter, it causes global warming., If humans hurt the world, animals will lose their homes., If we use plastics, oceans will be dirty., If the world becomes hot, ice will melt., If the ice melts, cities will be flooded., If we do something now, we won't have a sad future., If we use buses, the air will be cleaner., If the world is happy, animals will live longer., If the world is crowded, we won't have enough food.,

Zero and First Conditional

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