If we hadn't turned left, we wouldn't have got lost.
I didn't go by train because the ticket was so expensive.
I would have gone by train if the ticket hadn't been so expensive. / If the ticket hadn't been so expensive, I would have gone by train.
I didn't meet you at the airport because I didn't know when you were arriving.
If I had known when you were arriving, I would have met you at the airport. / I would have met you at the airport if I had known when you were arriving.
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