1. Yesterday at 4 o'clock I was reading books in the library.
2. The day before yesterday I was walking in the park.
3. Yesterday at 11 o'clock I was sleeping.
4. Yesterday at 7 o'clock my mother was cooking dinner.
5. While I was preparing for my exams my little brother was playing with his toys.
6. I was studying English yesterday.
7. While I was listening to music my little sister was dancing.
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Good Luck!