Воткните подходящую форму глагола to be . И сделайте вопросительным предложение

Воткните подходящую форму глагола to be . И сделайте вопросительным предложение :
1. Mary my sister.
2. Sam and Bob boys.
3. It a pencil.
4. St. Petersburg a beautiful city.
5. My granny old.
6. We students of this university.
7. I ill.
8. My parents engineers.
9. His brother a student.
10. Their cousins students.
1 I The sky blue.
12.His dog very big and dangerous.
13. I tall.
14. Mrs. Green a teacher of English.
15. The girls in the garden.
16. They very busy today.
17. Jane not here now. She at home.
18. Susan the best student in the group.