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2. Whose camera is this?
It's Bob's. It's his computer. It's his.
3. Whose watch is this?
It's Tony's. It's his watch. It's his.
4. Whose skateboard is this?
It's Bill's It's his skateboard. It's his.
5. Whose football is this?
It's Paul's and Ann's. It's their football. It's their's.