Meaning & Usage
Place か at the end of any Japanese sentence and it becomes a question. No word order changes, no auxiliary verbs — just one syllable appended to what you already know. Compare English: "You are a student" must become "Are you a student?" Japanese simply goes from 学生です to 学生ですか.
In polite speech — sentences ending in です or ます — か carries relatively flat or slightly falling intonation. The particle does the grammatical work of marking the question, so your voice does not need to rise the way it does in English. Sharp upward intonation on ですか can sound anxious or overwrought to Japanese listeners.
Casual speech works differently. Attaching か to a plain-form verb — 食べるか, 行くか — comes across as blunt and can feel confrontational, especially with someone you do not know well. Native speakers typically drop か entirely in casual exchanges and rely on rising intonation alone, or swap it for the softer particle の. At the N5 level, staying with polite forms will keep you appropriate in every situation.
One punctuation point worth noting: か absorbs the question mark in formal written Japanese. A sentence ending in ですか takes a period (。), not a question mark (？). You will see ？ in text messages and manga, but in essays, letters, and on the JLPT, the period is correct.
Structure & Formation
Forming a question with か is simple: take any complete Japanese sentence and add か at the end. Below are the most common patterns at the N5 level.
| Word Type | Statement | Question |
|---|---|---|
| Noun + です | 学生です。(You are a student.) | 学生ですか。(Are you a student?) |
| い-adjective + です | 寒いです。(It is cold.) | 寒いですか。(Is it cold?) |
| な-adjective + です | 元気です。(I am fine.) | 元気ですか。(Are you fine?) |
| Verb (ます form) | 食べます。(I will eat.) | 食べますか。(Will you eat?) |
| Verb (negative) | 行きません。(I will not go.) | 行きませんか。(Would you like to go? / Won't you go?) |
Note that ～ませんか carries a special nuance: it functions as a polite invitation or suggestion, similar to "Would you like to...?" or "Why don't we...?" in English. This is an important pattern to recognize and use correctly.
Example Sentences
Basic Yes/No Questions
日本語を勉強していますか。
Nihongo wo benkyou shite imasu ka.
Are you studying Japanese?
これは本ですか。
Kore wa hon desu ka.
Is this a book?
今日は月曜日ですか。
Kyou wa getsuyoubi desu ka.
Is today Monday?
Questions with Adjectives
この映画はおもしろいですか。
Kono eiga wa omoshiroi desu ka.
Is this movie interesting?
日本の食べものは好きですか。
Nihon no tabemono wa suki desu ka.
Do you like Japanese food?
その問題は難しいですか。
Sono mondai wa muzukashii desu ka.
Is that problem difficult?
Questions with Action Verbs
毎日運動しますか。
Mainichi undou shimasu ka.
Do you exercise every day?
明日、学校に来ますか。
Ashita, gakkou ni kimasu ka.
Will you come to school tomorrow?
昨日、映画を見ましたか。
Kinou, eiga wo mimashita ka.
Did you watch a movie yesterday?
Invitations Using ～ませんか
いっしょに昼ごはんを食べませんか。
Issho ni hirugohan wo tabemasen ka.
Would you like to eat lunch together?
今週末、公園に行きませんか。
Konshuumatsu, kouen ni ikimasen ka.
Would you like to go to the park this weekend?
Information Questions (with Question Words)
お名前は何ですか。
Onamae wa nan desu ka.
What is your name?
駅はどこですか。
Eki wa doko desu ka.
Where is the station?
これはいくらですか。
Kore wa ikura desu ka.
How much is this?
Common Mistakes
Mistake 1: Adding a Question Mark After か in Formal Writing
❌ 学生ですか？
✅ 学生ですか。
The particle か already marks the sentence as a question — no question mark needed. Adding ？ is redundant and reads as informal in essays, business letters, and formal documents. You may see it in chat or manga, but avoid it on the JLPT and in any formal writing.
Mistake 2: Using か with Plain-Form Verbs in Polite Situations
❌ 食べるか。(said to a teacher or stranger)
✅ 食べますか。
食べるか sounds blunt — the kind of thing a parent might say to a child, or a boss to a subordinate. It is not appropriate with teachers, customers, or anyone you do not know well. When speaking politely, always pair か with the ます form.
Mistake 3: Forgetting か in Information Questions
❌ お名前は何です。
✅ お名前は何ですか。
A question word like 何 (nani/nan), どこ (doko), or いつ (itsu) does not replace か — it works alongside it. Without か, お名前は何です reads as a flat statement, not a question. Both elements are required.
Mistake 4: Confusing ～ますか and ～ませんか
❌ いっしょに行きますか。(when intending to invite someone)
✅ いっしょに行きませんか。
行きますか asks "Are you going?" — it sounds like you are checking someone's schedule. 行きませんか is a warm invitation: "Would you like to go together?" When you want to invite rather than inquire, use the negative form.
Mistake 5: Overemphasizing Rising Intonation on ですか
❌ Steeply rising voice on ですか↑↑ ✅ Neutral or slightly falling intonation on ですか
English speakers instinctively lift their voice at the end of a question. In polite Japanese, か does that grammatical work — the intonation stays flat or drops slightly. Forcing a strong upward lilt can sound dramatic or emotionally charged in a way that was not intended.
Cultural Notes
Among close friends, か often disappears entirely. Instead of 行きますか, you would hear simply 「行く？」 — the plain form with rising intonation. Japanese conversation regularly drops elements that both speakers can infer from context, and sentence-final particles are often the first to go. This is not carelessness; it reflects how natural spoken Japanese actually works.
Business and service settings move in the opposite direction. Department store staff, hotel workers, and customer service representatives use 「～でございますか」, a step above ～ですか in formality. You do not need to produce this form at N5, but you will hear it constantly in shops and on the phone. Recognizing it prevents confusion.
Gender shapes how か is perceived in casual speech. Historically, men used plain-form + か or bare rising intonation, while women favored の as a gentler question marker. These patterns are less rigid among younger speakers today, but you will still encounter them in films, drama, and literature — and they remain useful for reading character and social register.
Finally, か can appear mid-sentence to embed a question inside a larger clause. 「彼が来るか分かりません」 means "I don't know whether he will come" — not a question directed at the reader. This use becomes important at higher JLPT levels, but noticing it now will save you from misreading comprehension passages later.
Related Grammar Points
- よ — Emphasis and Assertion (Grammar N5)
- です — Polite Copula (Is/Am/Are) (Grammar N5)
- ね — Seeking Confirmation or Sharing Feelings (Grammar N5)
- なに / なん — What (Japanese Interrogative Pronoun) (Grammar N5)
- しか — Nothing But, Only (Negative) (Grammar N5)
- に (ni) — Direction, Time, and Location Particle (Grammar N5)
JLPT Tips
か appears in almost every section of the N5 exam — listening, reading, and vocabulary. In the listening section, catching か at the end of a spoken sentence tells you immediately whether to expect an answer or a statement. Speakers do not always slow down for particles, so train your ear on this specifically.
Grammar selection questions may ask you to choose the correct sentence-final particle. When the sentence is clearly a question and ends in ます or です, か is the answer. No other standard particle does this job in polite speech.
The ますか vs. ませんか distinction comes up frequently in situational dialogue questions. ますか asks; ませんか invites. If the context involves two people making plans together, ませんか is almost always the target answer.
Watch for mid-sentence か in reading passages. 「彼女が来るか分かりません」 is a statement about uncertainty — not a question directed at the reader. Misreading it as a direct question will derail your comprehension of the whole passage.
One final point: formal written Japanese ends questions with か。(period), not か？. If a passage on the exam uses this punctuation, it is correct — do not second-guess it.