If she had rented a more economical car, she wouldn't have spent so much money on gas., If Jonas Salk hadn't invented a vaccine to protect people against polio, many more people would have gotten the disease., Could they have prevented the accident if they had known the tire were so old?, How many people would have been injured or killed if air bags hadn't been invented?, I wouldn't have gone to class if I had known I had the flu., If we had used our GPS, we wouldn't have gotten lost., If they hadn't planted those new genetically engineered tomatoes, they would have lost this year's crop., The airline wouldn't have canceled the flight if they hadn't had a program to predict engine failure.,

Conditional 3 _ Past unreal conditional

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