How to Make Questions in Japanese: The か Particle Guide

Forming questions in Japanese is surprisingly easy for beginners. Unlike English, you never rearrange word order. One particle — か (ka) — does all the work: add it to the end of any polite statement and the sentence becomes a question.

This guide covers everything you need at this stage: the mechanics of か, the core A は B ですか？ pattern, the most useful question words, and how questions work in everyday casual speech. If you haven't yet read the basic sentence structure guide, start there — this lesson builds directly on it.

How the か Particle Works

か is a sentence-final particle with one job: it converts a statement into a yes/no question without changing anything else in the sentence.

The rule: [Statement] + か？ → question

Here's what that looks like in practice:

Every word stays in place. The only changes are か？ at the end and a slight rise in your voice on the final syllable.

In polite speech, the full ending is always です + か = ですか？ — you'll use this form constantly at beginner and intermediate level.

Asking Complete Questions: The A は B ですか？ Pattern

Most of your sentences at this point follow the structure A は B です ("A is B"). Turning any of them into a question is always the same one step: add か.

A は B ですか？

Answering is equally straightforward: はい (hai) for yes, いいえ (iie) for no.

Cultural note: In natural conversation, Japanese speakers rarely answer with a bare はい or いいえ. A far more common confirmation is そうです (Sō desu — "That's right"), and disagreement is usually softened with ちがいます (Chigaimasu — "That's different/not right"). Learning these two phrases alongside はい and いいえ immediately makes your responses sound more natural.

The か rule works identically with adjective sentences. The useful adjectives guide is full of examples to practice converting adjective sentences into questions once you're ready.

Japanese Question Words at a Glance

Yes/no questions only cover one kind of questioning. To ask what, where, who, and when, Japanese uses 疑問詞 (gimonshi) — question words. All of them slot into the same sentence structure, with か still at the end in polite speech.

A note on 何: Use なん (nan) before です and time words (何ですか？, 何時ですか？), and なに (nani) before other particles. For now, 何ですか？ is the form you'll use most often.

Five question-word sentences in context:

1. これは何ですか？
   Kore wa nan desu ka?
   What is this?
2. おてあらいはどこですか？
   Otearai wa doko desu ka?
   Where is the bathroom?
3. おなまえは何ですか？
   Onamae wa nan desu ka?
   What is your name?
4. いつですか？
   Itsu desu ka?
   When is it?
5. あのひとは誰ですか？
   Ano hito wa dare desu ka?
   Who is that person?

Notice that the question word simply replaces the unknown piece of information — everything else in the sentence stays in its usual position.

Casual Questions: Rising Intonation Without か

In formal and semi-formal situations — with teachers, strangers, or anyone you address respectfully — ですか？ is always expected. In casual speech between friends and family, か is frequently dropped, and rising intonation alone signals the question.

For example: - がくせい？ (Gakusei↑?) — "Are you a student?" - これ、ほん？ (Kore, hon↑?) — "Is this a book?" - おなまえは？ (Onamae wa↑?) — "And your name is...?"

You'll hear this constantly in Japanese TV dramas, anime, and everyday conversation. For now, practise the formal ですか？pattern until it's automatic — the casual shortcut will feel natural as your listening exposure grows.

Common Mistakes Learners Make

Dropping か in formal contexts.
Once learners pick up casual speech patterns, they sometimes leave か out in polite situations. Always use ですか？with teachers, colleagues, or anyone you'd address with respectful language — it is never optional in those registers.

Placing か in the wrong position.
か belongs at the very end of the sentence — after every other element. A common error is inserting it after the topic: ~~これかはほんです？~~ The correct form is always: これはほんですか？

Confusing か with the particle が.
Both are particles and share a similar sound, so beginners sometimes swap them in writing. The functions are completely different: か marks a question at the end of a sentence; が marks the grammatical subject mid-sentence. If you're still building intuition for those two, the previous lesson on は and が covers the distinction in full.

Forgetting か when a question word is already present.
A sentence like これは何ですか？already contains a question word (何), but か is still required in polite speech. The question word identifies what is unknown — か is still needed to mark the sentence type. Never drop it in formal contexts even when a question word is present.

Not sure whether your か questions sound natural to a native speaker? Try a Free Trial lesson with Kind Japanese and practise forming questions live, one on one, over LINE — instant feedback from a real teacher makes the difference.

Practice Quiz

Work through each section before checking the answers below.

Part 1: Turn the Statement into a Question

Part 2: What Does It Mean in English?

Part 3: Write It in Japanese

Answers

FAQ

Does Japanese always need か to form a question?

In polite speech, yes — か is the standard question marker and should always be included. In casual conversation between close friends or family, speakers often drop か and rely on rising intonation instead. As a beginner, always use か until the casual form feels natural on its own.

What is the difference between ですか and か alone?

ですか？combines the polite copula です with the question particle か. Using か alone — without です — can sound blunt or even rude in many contexts. Always use ですか？in formal and semi-formal situations; it is the safe default for all learners at this stage.

Can I use か with adjective sentences too?

Yes — the rule is universal. Add か to the end of any polite statement and it becomes a question. For example, たかいですか？(Takai desu ka?) means "Is it expensive?" The structure is identical to the noun-based questions covered in this lesson.

Do question patterns change once I learn verbs?

Slightly — verbs have their own polite ending (-ます), but か still attaches at the end in exactly the same way. For example, いきますか？(Ikimasu ka?) means "Are you going?" The present-tense verb forms guide walks through these patterns in full once you're ready for the next step.

Continue Learning

← Understanding は vs が: the subject-marker distinction

→ Verb basics: your first Japanese action words

This is Lesson 44 of the Kind Japanese 100-day beginner curriculum — the question-formation foundation lesson, bridging the particles lessons and verb basics.