1. Is this your bag?
2. Is that your umbrella?
3. Is this your book?
4. Are these your books?
5. Is that your bicycle?
6. Are these your keys?
7. Are those your keys?
8. Is this your ... (не могу понять что в руке, если там множественный предмет тогда "Are these your ...)
9. Are those your glasses?
10. Are these your gloves?