Use the verb "to be" either in Present Simple or in Past Simple.
1. They ... 10 today.
2. Where ... John. I want to see him.
3. Ben ... 7 yesterday.
4. Where ... you last month?
5. Sam ... not in London now.
6. Fred ... in the park last week.
7. We ... at home today.
8. Who ... at school yesterday?
9. Bob and I ... singing now.
10. With whom ... your sister at the Zoo last week?