日本語のおしゃべり

Japanese Language
「Verbs」

「Interrogative + (particle) + Vdic+Kaか」
”（I don't know/can't tell) when, what, etc."

An interrogative (with or without a particle) followed by Vdic ka, is used to express a question embedded in a sentence.

Examples:
何が起こるかわかりません。
Nani ga okoru ka wakarimasen.
I can't tell what will happen.

どちらが負けるかわかりません。
Dochira ga makeru ka wakarimasen.
Which one of them will lose, I can't tell.

小野さんがいつ留学するか知りません。
Ono-san ga itsu ryūgaku suru ka shirimasen.
I don't know when Miss Ono will study abroad.

Hope this helps!

じゃまたね！
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