If the printing press hadn’t been invented, …, If humans had not discovered fire, …, If the Black Death hadn’t spread across Europe, …, If the first airplanes had failed, …, If people hadn’t explored new continents centuries ago, …, If electricity hadn’t been developed, …, If the Industrial Revolution had happened later, …, If humans had not landed on the Moon, …, If ancient civilizations hadn’t built cities, …, If modern medicine had been discovered earlier, ….

Third conditional speaking

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