1. I'm a pupil. I'm at school.
2. My brother is an artist. He isn't an engineer.
3. My sister is at work. She is a doctor.
4. He is a student.
5. Are you a student? No, I am a doctor.
6. My sister is at home.
7. We aren't at school. We are at home.
8. My brother is a pupil. He is at school.
9. Is your mother at home? No, she is at work.
10. Is your cousin at home? No, he is at school. He's a pupil.
11. Is your sister a teacher? No, she is a student.
12. Is your father at work? No, he is at home.
13. Is your sister a designer? - Yes, she is. - Is she at home? - No, she is at work.
14. My grandfather is a scientist.
15, My mother isn't a teacher. She is a doctor.
2. We found out that the plane has already arrived
3. He knew that his partner will come tomorrow