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Ответ:

1 You would save money on your electricity bill if you didn't leave the lights on.

2 If I hadn't missed the train, I wouldn't have been late for my job interview.

3 You wouldn't have failed the exam if you'd bothered to study.

4 If we spoke to the head teacher, do you think it would make a difference?

5 I would have lent you some money if you'd asked me.

6 If we didn't have a car, I'd have to walk everywhere.