Finished chapter 2 just in time! Asking “whose X is this?” tripped me up a bit consider “this” is the topic…
これはだれのかさですか。
なぜ「これ」は主題の？
Also in the above should I write this out as 「主題なのですか」or 「主題のですか」or is it fine as-is? Kinda confused on how to write out why questions.