Rewrite the sentences

Exercise 3. Rewrite the sentences using” was were”:
- Gạch chân động từ “tobe” của thì Hiện tại đơn
- Chuyển “tobe” sang thì Quá khứ dơn
(Làm như ví dụ 1)
1. I am happy to see you.
I was happy to see you.

13. Are they hungry?
 .................................................................
14. Thomas isn’t at school.
 .................................................................
15. Why is she late?
 .................................................................
16. My brother isn’t a doctor.
 .................................................................
17. They aren’t here.
 .................................................................
18. Is Eva a teacher?
 .................................................................