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Review the traveler's frustrated diary entry. They are stuck at the airport because they left their passport on the kitchen counter at home.
Select ALL the sentences that correctly use the third conditional to express their past regrets!
The correct answers are If I had remembered my passport, I wouldn't have missed the flight. and I could have caught the plane if I hadn't left my passport at home.
To express regret about a past event that cannot be changed, we use the past perfect in the condition clause (If I had remembered...) and a past modal structure in the result clause (...wouldn't have missed / ...could have caught).
"If I remembered" uses the past simple, which is for the second conditional (unreal present), not the third conditional (unreal past). "Hadn't have left" is grammatically incorrect because we only use one auxiliary have/had in the if-clause.