Forming Questions with か (ka)
The simplest way to turn any Japanese statement into a question is to add the particle か (ka) to the end. There is no need to change the word order like in English — the sentence stays exactly the same, and か signals that you are asking rather than telling.
日本語を話します。
nihongo wo hanashimasu.
I speak Japanese. (statement)
日本語を話しますか？
nihongo wo hanashimasu ka?
Do you speak Japanese? (question)
これはおいしいですか？
kore wa oishii desu ka?
Is this delicious?
田中さんは学生ですか？
Tanaka-san wa gakusei desu ka?
Is Tanaka a student?
In written Japanese, a question mark is not strictly necessary when か is present — the particle itself signals a question. However, in modern casual writing (texting, social media), question marks are commonly used alongside か or even without it.
Casual Questions: Rising Intonation
In casual conversation among friends and family, the か particle is often dropped entirely. Instead, speakers simply raise their intonation at the end of the sentence, much like in English.
これ、おいしい？
kore, oishii?
Is this good?
明日、来る？
ashita, kuru?
Are you coming tomorrow?
Adding か to casual (plain form) sentences can sound blunt, aggressive, or interrogative — almost like a police interrogation. Saying 食べるか？ (taberu ka?) to a friend sounds harsh compared to the softer 食べる？ (taberu?) with rising intonation. Reserve か for polite/formal speech, and use intonation alone in casual contexts.
Essential Question Words
Japanese question words follow a consistent pattern and are placed where the answer would go in the sentence — they do not move to the front like in English.
何 (nani / nan) — What
何を食べますか？
nani wo tabemasu ka?
What will you eat?
これは何ですか？
kore wa nan desu ka?
What is this?
The reading changes depending on what follows: なに (nani) before を and が, なん (nan) before です, で, and counters.
誰 (dare) — Who
あの人は誰ですか？
ano hito wa dare desu ka?
Who is that person?
誰が来ますか？
dare ga kimasu ka?
Who is coming?
どこ (doko) — Where
トイレはどこですか？
toire wa doko desu ka?
Where is the bathroom?
どこに住んでいますか？
doko ni sunde imasu ka?
Where do you live?
いつ (itsu) — When
いつ日本に来ましたか？
itsu nihon ni kimashita ka?
When did you come to Japan?
会議はいつですか？
kaigi wa itsu desu ka?
When is the meeting?
なぜ / どうして (naze / doushite) — Why
どうして日本語を勉強していますか？
doushite nihongo wo benkyou shite imasu ka?
Why are you studying Japanese?
なぜ遅れましたか？
naze okuremashita ka?
Why were you late?
どうして sounds softer and more conversational than なぜ, which can sound more formal or demanding. For casual speech, you can also use なんで (nande), which is the most casual of the three.
どう (dou) — How
日本はどうですか？
nihon wa dou desu ka?
How is Japan? (What do you think of Japan?)
どうやって作りますか？
dou yatte tsukurimasu ka?
How do you make it?
いくら (ikura) — How Much
これはいくらですか？
kore wa ikura desu ka?
How much is this?
全部でいくらですか？
zenbu de ikura desu ka?
How much is it in total?
どれ (dore) — Which One
どれがいいですか？
dore ga ii desu ka?
Which one is good?
田中さんの傘はどれですか？
Tanaka-san no kasa wa dore desu ka?
Which one is Tanaka's umbrella?
Question Word + か = "Some-"
A powerful pattern in Japanese: adding か to a question word creates an indefinite pronoun.
| Question Word | + か | Meaning |
|---|---|---|
| 何 (nani) | 何か (nanika) | something |
| 誰 (dare) | 誰か (dareka) | someone |
| どこ (doko) | どこか (dokoka) | somewhere |
| いつ (itsu) | いつか (itsuka) | sometime |
何か食べましたか？
nanika tabemashita ka?
Did you eat something?
誰か来ましたか？
dareka kimashita ka?
Did someone come?
Answering Yes and No
The basic responses are はい (hai — yes) and いいえ (iie — no), but Japanese "yes" and "no" work differently from English in negative questions.
日本語は難しくないですか？
nihongo wa muzukashikunai desu ka?
Isn't Japanese difficult?
はい、難しくないです。
hai, muzukashikunai desu.
Yes (that's right), it is not difficult.
In this case, はい confirms the negative statement — "Yes, you are correct, it is not difficult." In English, the answer to "Isn't it difficult?" would be "No, it isn't" — the exact opposite word.
In Japanese culture, direct refusal is often avoided. Instead of a clear いいえ (no), you may hear softer deflections like ちょっと... (chotto...) meaning "a little..." (implying difficulty or refusal), or うーん、どうでしょう (uun, dou deshou) meaning "hmm, I wonder..." These indirect answers are not evasive — they are considered polite and considerate of the other person's feelings.
When a Japanese person answers はい (hai) during conversation, it does not always mean they agree. It often simply means "I'm listening" or "I understand what you're saying." This is one of the most common sources of miscommunication between Japanese and non-Japanese speakers. Pay attention to the full response, not just the initial はい.
Quick Reference Table
| Question Word | Reading | Meaning | Example |
|---|---|---|---|
| 何 | nani / nan | what | 何ですか？ (What is it?) |
| 誰 | dare | who | 誰ですか？ (Who is it?) |
| どこ | doko | where | どこですか？ (Where is it?) |
| いつ | itsu | when | いつですか？ (When is it?) |
| なぜ / どうして | naze / doushite | why | なぜですか？ (Why?) |
| どう | dou | how | どうですか？ (How is it?) |
| いくら | ikura | how much | いくらですか？ (How much?) |
| どれ | dore | which one | どれですか？ (Which one?) |
| いくつ | ikutsu | how many | いくつですか？ (How many?) |
| どの | dono | which (+ noun) | どの本？ (Which book?) |
Summary
Asking questions in Japanese is straightforward once you understand the core patterns. The key takeaways:
- Add か to the end of a polite sentence to form a question — no word order change needed
- Use rising intonation instead of か in casual speech — adding か to plain forms can sound aggressive
- Question words stay in place — put them where the answer would go, not at the start of the sentence
- Question word + か = indefinite — 何か (something), 誰か (someone), どこか (somewhere)
- Watch out for はい — it can mean "yes," "I agree," or simply "I'm listening" depending on context
