The given answer to the question I'm supposed to ask in my workbook is:

それは たけしさんの ぼうし です。

But I can't figure out if my question should be:

このぼうしは だれの ですか。


だれの このぼうし ですか。

Thank you!


I can't figure out if my question should be このぼうしは だれの ですか。OR だれの このぼうし ですか。

The first one is correct, because...

The genitive case particle の works like the English 's or of, as in:

わたしのぼうし my hat
あなたのぼうし your hat
たけしさんのぼうし Takeshi-san's hat
だれのぼうし whose hat
わたしのこのぼうし this hat of mine (lit. my this hat)

の can also be used for (someone)'s (stuff), as in:

わたしの mine
あなたの yours
たけしさんの Takeshi-san's (stuff)
だれの whose (stuff)


それはたけしさんのぼうしです。 That is Takeshi-san's hat.

To turn this into a question asking だれの(whose), you'd replace たけしさん with だれ, add the interrogative particle か at the end (and replace それ with これ), as in:

これはだれのぼうしです。 Whose hat is this?

そのぼうしはたけしさんのです。 That hat is Takeshi-san's.

To turn this into a question, you'd do the same: たけしさん→だれ, です→ですか (and replace その with この this time):

このぼうしはだれのです。 Whose is this hat?


これは だれの ぼうし ですか。
Whose hat is this?

それは たけしさんの ぼうし です。
That is Mr. Takeshi's hat.

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