〜ことか: 'How...!' (Deep Emotion)
What it means
〜ことか takes a question word and turns it into a heartfelt exclamation. The question word (どんなに "how much," なんと "how," どれほど "to what extent," 何度 "how many times") sets up the intensity, and ことか delivers the emotional punch:
この日をどんなに待っていたことか。
この ひを どんなに まって いた ことか。
How long I've waited for this day!
どんなに…ことか = how very… — it's an exclamation, not a real question.
ヤッタンに何度注意したことか。
ヤッタンに なんど ちゅういした ことか。
How many times have I warned Yattan!
何度…ことか = expressing exasperation at the sheer number of times.
合格と聞いて、どれほどうれしかったことか。
ごうかくと きいて、どれほど うれしかった ことか。
How happy I was when I heard I'd passed!
The speaker isn't seeking an answer — they're conveying that the feeling was beyond words. English gets the same effect with "How…!" or "I can't tell you how…"
How to form it
Put a question word at the front, then attach ことか to the plain form of what comes before it:
| Word type | Attachment | Example |
|---|---|---|
| Verb | plain form + ことか | どんなに泣いたことか (how much I cried) |
| い-adjective | plain form + ことか | どれほどうれしいことか (how happy I am) |
| な-adjective | な + ことか | どんなに静かなことか (how quiet it is) |
| Noun | (rare) — usually recast | — |
| Softer variant | …ことだろう / ことでしょう | どんなにうれしいことだろう (how happy [I'd be]!) |
The opening question word is the key ingredient: どんなに / なんと / どれほど / いかに for degree, 何度（も）/ 何回 for frequency. The variant 〜ことだろう / 〜ことでしょう softens it slightly and is common when imagining or wishing.
先生がいてくれたら、どんなに心強いことだろう。
せんせいが いて くれたら、どんなに こころづよい ことだろう。
How reassuring it would be if Sensei were here!
ことだろう = a softer, more reflective version of ことか.
モチに会えなくて、どれほど寂しかったことか。
モチに あえなくて、どれほど さびしかった ことか。
How lonely I was, unable to see Mochi!
弟が無事だと知って、なんとほっとしたことか。
おとうとが ぶじだと しって、なんと ほっとした ことか。
What a relief it was to learn my little brother was safe!
Register and feel
〜ことか leans literary and emotional. You'll see it in novels, essays, speeches, and heartfelt spoken moments — not in casual everyday chat about lunch. It works best with genuinely big feelings: relief, longing, gratitude, frustration, joy. Because it carries weight, sprinkling it into small talk sounds theatrical. Save it for when the emotion is real and strong.
Common mistakes
- Forgetting the question word. ことか needs a どんなに / なんと / どれほど / 何度 up front to land. ×心配したことか alone feels incomplete; ○ どんなに心配したことか.
- Treating it as a real question. It's rhetorical/exclamatory — no answer is expected. Don't follow it with か-style question intonation hunting for a reply; it ends a thought with feeling.
- な-adjective without な. Use な before ことか: ○どんなに静かなことか, ×どんなに静かことか.
- Using it for trivial things. ことか is heavy and literary. For a small everyday "I really wanted that," plain 〜たい or とても is more natural.
Quick recap
- 〜ことか = an exclamation of strong emotion: "How very…! / How many times…!"
- Needs a question word in front: どんなに / なんと / どれほど / 何度.
- Attaches to plain forms; な-adjectives take な.
- It's rhetorical, not a real question — you're voicing a feeling.
- Softer variant: 〜ことだろう / ことでしょう; register is literary/emotional.
Your turn
Complete each sentence with the right question word + ことか.
Start the 5-question drill →Frequently asked questions
Is 〜ことか a question?
No — it only looks like one. It's a rhetorical exclamation of strong emotion. どんなに心配したことか means 'How worried I was!', not 'Did I worry?' No answer is expected.
What's the difference between ことか and ことだろう?
They're very close. ことだろう / ことでしょう is a softer, more reflective version, common when imagining or wishing (どんなにうれしいことだろう 'how happy I'd be!'). ことか feels a touch more direct and exclamatory.
Which question words go with ことか?
For degree: どんなに, なんと, どれほど, いかに. For frequency: 何度(も), 何回. The question word is required — it's what gives ことか its 'how very…!' force.
How does な-adjective attach?
Add な before ことか: どんなに静かなことか. Verbs and い-adjectives use their plain form directly: 泣いたことか / うれしいことか.