A: Have you ever overslept?
B: Yes, I have. I overslept yesterday.
A: Why did you oversleep?
B: Well, before I went to sleep, I had forgotten set my alarm clock.
A: Why did you forget set your alarm clock.
B: After I had prepared for my English test late at night, I fell asleep at my desk.
B: Yes, I have. I overslept yesterday.
A: Why did you oversleep?
B: Well, before I went to sleep, I had forgotten set my alarm clock.
A: Why did you forget set your alarm clock.
B: After I had prepared for my English test late at night, I fell asleep at my desk.

