Sure, they can. Many novels are written in past tense to tell a story that has already happened.
Definitely. Past tense is often used in novels because it provides a clear chronological order and makes it easier for the readers to follow the plot. It's a tried and true method that works well for a wide range of genres and storylines.
Yes, it's quite common. Past tense helps create a sense of reflection and allows the author to unfold the events one after another. It gives a more traditional storytelling feel. Also, it can make the narrative more engaging and immersive for the readers.