～かどうか
Whether something is true or not
You'll be able to place a yes-or-no uncertainty inside a longer sentence.
蓮は店が開いているかどうか調べます。
ren wa mise ga aite iru ka dou ka shirabemasu.
What do you think this sentence means?
Ren checks whether the shop is open.
Embed a yes-or-no question
～かどうか puts “whether or not” inside another sentence. It lets you say you know, check, or are unsure about a yes-or-no issue.
明日行けるかどうか分かりません。
ashita ikeru ka dou ka wakarimasen.
I do not know whether I can go tomorrow.
Form and use ～かどうか
Nouns and な-adjectives omit だ before かどうか. Do not use it after a question word such as どこ; that kind of embedded question uses か alone.
明日行けるかどうか分かりません。
ashita ikeru ka dou ka wakarimasen.
I do not know whether I can go tomorrow.
これで大丈夫かどうか確認します。
kore de daijoubu ka dou ka kakunin shimasu.
I will check whether this is all right.
明日晴れるかどうか、まだ分かりません。
ashita hareru ka dou ka, mada wakarimasen.
We don't know yet whether or not it'll be sunny tomorrow.
この服が似合うかどうか、着てみます。
kono fuku ga niau ka dou ka, kite mimasu.
I'll try these clothes on to see whether or not they suit me.
お店が今日開いているかどうか、電話で聞いてみます。
omise ga kyou aite iru ka dou ka, denwa de kiite mimasu.
I'll call and ask whether or not the shop is open today.
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