If you boil water, you make it safe to drink.  - Zero conditional: It describes something that is generally true. , If we survived an apocalypse, we would need to rediscover all this knowledge. - Second conditional: It describes an improbable or imaginary situation in the present or future and its consquence., If we look after this incredible world, we won't need to rebuild it from zero. - First conditional: It describes a possible situation in the present or future.,

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