N4 grammar
〜かどうか
kadouka
Whether or not
Formationplain form + かどうか
かどうか builds a yes-or-no question into a larger sentence: I do not know whether he is coming. Drop the どうか and use just か when the embedded question has a question word in it. だ disappears in front of it after a noun.
Examples
〜かどうか is marked in each sentence. Tap any word for its dictionary entry.
明日雨が降るかどうか知らない。
I don't know if it will rain tomorrow.
彼が賛成するかどうかはさだかではない。
It is uncertain whether he will agree or not.
彼は来るかどうか疑わしい。
Whether or not he will come is doubtful.
花子は不信に思って本当かどうか問いただした。
Hanako questioned his sincerity.
その前提が妥当かどうかよく考えるべきだ。
You ought to think over whether the premise is valid or not.