We use whose to ask questions about possession:
|Pattern A||Pattern B|
|Whose coat is this?||Whose is this coat?|
|Whose book is that?||Whose is that book?|
|Whose pens are those?||Whose are those pens?|
|Whose bags are those?||Whose are those bags?|
Be careful not to confuse whose and who's (= who is). They are pronounced in the same way but spelled differently:
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