Does Lynn have (haar) own website?
Yes, this one is (van haar).

Is this (onze) tent?
No, it is (van hen).

Where is (mijn) umbrella?
David has it. He lost (die van hem) last weekend.

Is this (jouw) book?
Yes, it is (van mij).

I'm not sure. Is that (hun) new car?
No, it is (die van ons).

Are you sure this is (jouw) bike?
No, I think it's (van hem).