疑What you think and know

Whether, and I wonder

Put a question inside a sentence with か or かどうか, and wonder out loud with かしら or かな.

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A question inside a sentence

か and かどうか

彼(かれ)が来(く)るかどうか分(わ)かりません。Kare ga kuru kadouka wakarimasen.

I don't know whether he's coming.

A yes-or-no question.

彼(かれ)がいつ来(く)るか分(わ)かりません。Kare ga itsu kuru ka wakarimasen.

I don't know when he's coming.

With a question word, use just か.

Forms

What goes before か

Plain form, and だ drops.

Before itExample
Verb or い adjective行くかどうか, 高いかどうか
な adjective静かかどうか
Noun学生かどうか
Past行ったかどうか

In use

Common verbs after it

この服(ふく)が似合(にあ)うかどうか見(み)てください。Kono fuku ga niau kadouka mite kudasai.

Please see whether these clothes suit me.

どこに行(い)くか決(き)めましょう。Doko ni iku ka kimemashou.

Let's decide where to go.

何(なに)を買(か)ったか忘(わす)れました。Nani o katta ka wasuremashita.

I forgot what I bought.

本当(ほんとう)かどうかが問題(もんだい)です。Hontou kadouka ga mondai desu.

Whether it's true is the question.

It works like a noun and can take が or を.

Wondering

かしら and かな

明日(あした)は晴(は)れるかしら。Ashita wa hareru kashira.

I wonder if it'll be sunny tomorrow.

Traditionally women's speech.

明日(あした)は晴(は)れるかな。Ashita wa hareru kana.

I wonder if it'll be sunny tomorrow.

Casual and used by anyone today. Often stretched to かなあ.

Others wonder too

For past or others, use と思う

彼女(かのじょ)は来(く)るかなと思(おも)っていました。Kanojo wa kuru kana to omotte imashita.

I was wondering if she'd come.

“I wonder” itself has to be in the present.

これでいいかしら。Kore de ii kashira.

I wonder if this is OK.

Check yourself

What kind of question is inside?

正(ただ)しいかどうか調(しら)べます。Tadashii kadouka shirabemasu.

Your turn

か or かどうか?

どこで買(か)った__覚(おぼ)えていません。Doko de katta oboete imasen.

I don't remember where I bought it.

Say it yourself

Before the party

You're not sure whether your friend will come, and you don't know what time it starts. You wonder aloud if it'll be fun.

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