Reading: Past Perfect
Last week, I arrived at the airport very early because I wanted to catch my flight. When I arrived, I realized that I had forgotten my passport at home. I was very worried because I had already checked in online. My mother had already called the airline to explain the situation. Luckily, I had packed everything else in my bag. By the time I got back home and returned to the airport, the flight had not left yet. I learned that it is important to check everything before leaving.