1)
A: Were you at school yesterday?
B: Yes, I was at school yesterday. I attended all my classes and even participated in a group project during the afternoon.
2)
A: Was your mother at home on Sunday?
B: No, my mother wasn't at home on Sunday. She spent the day visiting my grandparents who live in the countryside.
3)
A: Were you with your friend last night?
B: Yes, I was with my friend last night. We went to see a movie and then had dinner at our favorite restaurant.
4)
A: Were you in bed early on Sunday?
B: Yes, I was in bed early on Sunday. I wanted to get a good night's sleep to be well-rested for the busy week ahead.