Mastering the Japanese Question Marker: か (ka)

Level: JLPT N5

Welcome to your ultimate guide to one of the most fundamental particles in the Japanese language: か (ka).

In English, we signal a question by changing our word order (e.g., "You are a student" becomes "Are you a student?") or by adding a question mark at the end of a sentence. In Japanese, grammar is much friendlier. To turn almost any statement into a question, you simply keep the sentence structure exactly as it is and add the particle か to the very end.

Think of か as a spoken question mark.

Adding か to the end of a polite sentence instantly transforms it into a question.

With Nouns & Adjectives (です + か)

• Statement: これ は 本 です。 (Kore wa hon desu.) = This is a book.本
• Question: これ は 本 ですか。 (Kore wa hon desu ka?) = Is this a book?本

With Verbs (ます + か)

• Statement: 水 を 飲みます。 (Mizu wo nomimasu.) = I drink water.水飲
• Question: 水 を 飲みますか。 (Mizu wo nomimasu ka?) = Will you drink water? / Do you drink water?水飲

The Pitch

When pronouncing か at the end of a question, your voice should rise slightly, just like it does at the end of an English question.

The Missing "?"

In traditional, formal Japanese writing, a question mark (?) is not used. Because the particle か already explicitly signals that the sentence is a question, a simple Japanese period (。) is used instead:

• Correct: そうですか。 (Is that so?)
• Note: In modern, casual writing (like manga or text messages), you will frequently see the question mark used (ですか？), but it is omitted in formal contexts.

Let's look at three essential N5 sentence patterns using か.

Example A: Asking "Who/What/Where" (Using Question Words)

When you use question words like 何 (nani - what), だれ (dare - who), or どこ (doko - where), you still need か at the end of the sentence.何

• Japanese: これ は 何 ですか。何
• Romaji: Kore wa nani desu ka.
• English: What is this?

Example B: Polite Invitations

In Japanese, asking a negative question with か is a highly polite way to invite someone to do something (similar to "Won't you...?" in English).

• Japanese: いっしょに 行きませんか。行
• Romaji: Isshoni ikimasen ka.
• English: Won't you come/go with me? (Shall we go together?)

Be careful! か is primarily used to end polite sentences (ending in desu or masu).

If you add か to a casual, plain-form verb, it can sound sharp, masculine, or demanding.

• Polite & Natural: 行きますか。 (Ikimasu ka? - Are you going?)行
• Casual & Harsh: 行くか。 (Iku ka? - You going? / Shall we go? - Sounds very blunt).行

The Casual Solution: In casual Japanese, speakers simply drop か entirely and use a rising intonation on the last word.

• Casual & Natural: 行く？ (Iku? [with rising pitch] - Going?)行

1. か acts as a verbal question mark at the end of a sentence.
2. It does not require you to change the word order of the sentence.
3. In formal writing, end the sentence with a period (。), not a question mark.
4. Keep か paired with polite forms (desu/masu) to maintain a friendly, natural tone!