Chuyển các câu sau sang cách nói số nhiều: This is a couch. Is there a bookshelf in his room. Is that your teacher? There is a person in my year

Chuyển các câu sau sang cách nói số nhiều
1. this is a couch
2. is there a bookshelf in his room
3. is that your teacher ?
4. there is a person in my year
5. I am an engineer
6. I'm in class 3a
7. she has a child
8. that is an armchair
9. there isn't a bookshelf in my room
10. my brother is in class 9a