~かどうか
〜ka dou ka
JLPT N4 Neutral
Formation
Verb-casual + かどうか, い-Adjective + かどうか, な-Adjective + (だ)かどうか, Noun + (だ)かどうか
Used to express 'whether' or 'if' in indirect questions or statements.
When to use
Embedded yes/no question, 'whether or not' (来るかどうか分からない).
Explanation
The ~かどうか grammar point is used to express 'whether' or 'if' in indirect questions or statements. It is often used to express uncertainty or to inquire about information in a more polite form. ~かどうか can be used with verbs, い-adjectives, な-adjectives, and nouns.
Example sentences
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I don't know if he will come or not.
Kare ga kuru ka dou ka shirimasen.
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Please tell me if this book is interesting or not.
Kono hon ga omoshiroi ka dou ka oshiete kudasai.
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I don't know whether she is beautiful or not.
Kanojo ga kirei da ka dou ka wa wakarimasen.
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I don't remember if he is a teacher or not.
Kare ga sensei da ka dou ka oboete imasen.
Whether Or Not (To Do X)
Corpus examples (60)
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Do you know if he has a girlfriend?
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Whether she will agree or not is not clear.
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The point is whether he will read the letter.
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Whether you like it or not doesn't matter.
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I will call my grandmother to see whether or not she needs anything.
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I can tell whether it's Dad or not by the sound of his footsteps.
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They were not sure whether they could come or not.
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I am not quite sure if we can meet your requirements.
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The important thing is whether you do your best or not.
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It is not important whether we win the game or not.
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I can not tell if it will rain tomorrow.
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I don't know if George is coming.
トムってフランス語の勉強を楽しんでいそうだけど、本当かどうかは知らない。
I think Tom enjoys studying French, but I'm not sure.
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I don't know if I'm stupid or not.
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Ask Mary if she can speak French.
あなたがするのと同じ位に、相手が自分を愛してくれるかどうか判らないときには、誰かを愛することは難しい。
It is difficult to love somebody when it's not clear whether or not the other person loves you the same way.
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He checked that all the doors were safely shut.
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I do not know whether it is good or not.
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Tom asked Mary if she spoke more than three languages.
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I asked her if she had been to Mexico.
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Our success depends on whether he helps us or not.
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Tom doesn't know whether Mary will come or not.
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I don't know whether the story is true or not.
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Whether he has the operation depends upon the availability of the organ.
問題となっている決定要因は、この社会福祉計画が移民の流入を促進するかどうかということである。
The determining factor in question is whether this social welfare plan can facilitate the influx of immigrants.