Using whose in adjective clause

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You use whose in questions; to ask about possession.

Whose camera is that? Is it yours?

And you use whose in Adjective Clauses, too!

The people whose picture I took smiled and waved at the camera.

I took their picture at a birthday party. Be sure to notice that I didn't say:

The people who I took their picture smiled and waved at the camera.

No, it's:

The people whose picture I took smiled and waved at the camera.

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