1) Was he at home 3 days ago?
2) Were they at home 3 days ago?
3) Was my sister at school a week ago?
4) Were my sister and my brother at school a week ago?
5) Was a little boy in the garden last Sunday?
6) Were little boys in the garden last Sunday?
7) Was Ivanov in the museum yesterday?
8) Were Ivanov and his family in the museum yesterday?
9) Was there a book on the table?
10) Were there books on the table?