Я не в совершенстве владею английским,но мне кажется что будет так:
1. Whose is this pen? - This is my pen.
2. Whose book is this? - This is your book.
3. Whose is this table? -
It's as my brother.
4. Whose is this bag? - This bag is my mom.
5. Whose is this pencil? - This is my sister's pencil.
6. It's your book? Yes.
7. This book your brother? - No, it's my book.
8. Where is your desk? - He's in the middle com-coordinates.
9. Where is your pen? - It is in my pocket.
10. Where's your book? - She is on the table.
11. Where is your mom? - She is at work.
12. Where is your brother? - He is in school.
13. Where's your sister? - It is home.
14. Whose is this pencil? - This is my pencil. -Where's my pencil? - He's on the table. 15. Whose watch? - This is my watch. - Where's my watch? -They are on the table.