Japanese Question Words: Who, What, Where, Why & How

The first time I tried to ask a question in Japanese, I pushed the question word to the front, because that is what English had trained me to do.

"Where is the bathroom?"

My brain wanted to say something like "where bathroom is?" But Japanese does not work that way.

My Japanese teacher understood me, but she smiled and moved どこ back into the sentence where the missing information belonged:

トイレはどこですか。

That small correction made question words feel much less mysterious. Japanese does not need a special "question word order" the way English does. In polite speech, you usually put the unknown word exactly where the answer would go, then add か at the end.

Once that clicks, 誰, 何, どこ, いつ, どうして, and どう become some of the most useful words in your whole beginner toolkit.

Table of Contents

• The Simple Rule
• Quick Chart
• 誰: Who
• 何: What
• どこ: Where
• いつ: When
• どうして, なぜ, なんで: Why
• どう: How
• Question Words and Particles
• Common Mistakes
• Mini Practice
• FAQ

The Simple Rule

Here is the rule I wish someone had given me earlier:

Put the Japanese question word where the answer would naturally go.

Look at this pair:

The answer is 田中さん. The unknown person is 誰. So 誰 goes in the same spot.

Another one:

The answer is 京都に. The unknown place is どこに. Same slot, same particle.

That is the heart of it. If you already know basic particles, question words are not a new grammar system. They are just placeholders for missing information.

If particles still feel shaky, start with the は particle, が particle, and the full Japanese particles guide. Question words get much easier once those pieces stop moving around in your head.

Quick Chart

You do not need to memorize every possible question word today. Start with the first six: 誰, 何, どこ, いつ, どうして, どう. They cover a surprising amount of real conversation.

誰だれ: Who

誰 means "who."

The most important pattern is:

誰だれが...

Who...

Because question words ask for new information, 誰 often takes が, not は.

Natural examples:

Notice how the particle changes with the job:

• 誰が means who is doing it.
• 誰の means whose.
• 誰と means with whom.

That is why memorizing "誰 means who" is only half the work. The particle tells you what kind of "who" you are asking about.

Common beginner mistake:

✗ 誰だれは来きますか。
✓ 誰だれが来きますか。

Use が when you are asking who the person is. は sounds wrong here because you are not setting a known topic. You are asking for unknown information. This is the same idea from our は vs が guide.

何なに: What

何 means "what," but it has two common readings: なに and なん.

This is one of those details that annoys beginners because both readings use the same kanji. The good news is that the common patterns are predictable enough.

The rough beginner rule:

何 is often read なに before particles like を and が, and なん before です, の, and many counters.

It is not perfect, but it will get you through most N5 and N4 sentences.

Natural examples:

If you are asking about wanting to do something, you will use 何 all the time:

何なにを食たべたいですか。
Nani o tabetai desu ka.
What do you want to eat?

That pairs naturally with the たい form and our guide to saying "I want" in Japanese.

どこ: Where

どこ means "where."

This is probably the question word you will use most while traveling:

トイレはどこですか。
Toire wa doko desu ka.
Where is the bathroom?

駅はどこですか。
Eki wa doko desu ka.
Where is the station?

But どこ changes shape a little depending on the particle:

The に vs で difference matters:

に often points to location or direction. で marks the place where an action happens. If that is still fuzzy, read に vs で after this.

いつ: When

いつ means "when."

It is simple, useful, and a little different from English because you often do not need a particle after it.

Natural examples:

Beginners sometimes try to force に after いつ because time words often use に:

✗ いつに行いきますか。
✓ いつ行いきますか。

Specific times can use に:

七時しちじに行いきます。
Shichiji ni ikimasu.
I will go at seven.

But the question word いつ usually stands without に. You can learn more time patterns in how to tell time in Japanese.

どうして, なぜ, なんで: Why

Japanese has several ways to ask "why." They are not identical.

If you are a beginner, use どうして most of the time. It is natural without being too stiff or too casual.

Natural examples:

どうして日本語にほんごを勉強べんきょうしていますか。
Doushite nihongo o benkyou shite imasu ka.
Why are you studying Japanese?

なぜそう思おもいますか。
Naze sou omoimasu ka.
Why do you think so?

なんで来こなかったの？
Nande konakatta no?
Why didn't you come?

That last one can sound sharp depending on your tone. In English too, "Why didn't you come?" can be gentle or annoyed. Japanese is the same. If you are talking to someone you do not know well, どうして is safer.

One small cultural note: direct "why" questions can sometimes feel like you are challenging the other person. If you want to sound softer, add んですか:

どうして日本語にほんごを勉強べんきょうしているんですか。
Doushite nihongo o benkyou shite irun desu ka.
Why are you studying Japanese?

The んですか makes it feel more like "I am curious about the reason" instead of a blunt interrogation.

どう: How

どう means "how," but not always "how" as in "by what method." It often means "how is it?" or "what do you think?"

Natural examples:

This is the important distinction:

So if you want to ask "How do I use this?", どう alone is not enough:

✓ これはどうやって使つかいますか。
Kore wa dou yatte tsukaimasu ka.
How do you use this?

どう is closer to asking for an impression. どうやって asks for a method.

Question Words and Particles

This is where question words start to feel like real Japanese, not a vocabulary list.

The particle does not disappear just because there is a question word. It still marks the role of the unknown part.

There is one pattern worth remembering early:

Question word plus が is common when asking who or what the subject is.

誰だれが来きますか。
Who is coming?

何なにが必要ひつようですか。
What is necessary?

誰だれは and 何なには are not impossible in every sentence, but they are usually not what beginners want. If you are asking for unknown information, が is the safer instinct.

Want to test a sentence? Paste it into the Japanese Sentence Analyzer and look at which particle each word is using.

Common Mistakes

1. Moving the question word to the front

English says "Where are you going?" Japanese says the equivalent of "You are going where?"

✗ どこあなたは行いきますか。
✓ どこに行いきますか。

The Japanese version sounds natural because どこに sits where the destination would sit.

2. Using は after every question word

✗ 誰だれは来きますか。
✓ 誰だれが来きますか。

✗ 何なには好すきですか。
✓ 何なにが好すきですか。

は marks a topic. Question words usually ask for new information, so が often fits better.

3. Saying なにですか instead of なんですか

People will understand you, but これは何ですか is normally read:

✓ これは何なんですか。
Kore wa nan desu ka.
What is this?

Not:

✗ これは何なにですか。

4. Using どう when you need どうやって

どうですか means "How is it?" or "What do you think?"

If you want the method, use どうやって:

✓ アプリはどうですか。
How is the app?

✓ このアプリはどうやって使つかいますか。
How do you use this app?

5. Making "why" sound too sharp

なんで？ is common with friends, but it can sound blunt by itself.

Softer:

どうしてですか。
Why is that?

Even softer:

どうしてそう思おもったんですか。
Why did you think that?

Mini Practice

Try answering these out loud before checking the English.

If you can answer these six, you can already keep a basic conversation alive longer than most beginners expect.

The main rule is still the same: put the Japanese question word where the answer would naturally go.

To make these patterns automatic, try practicing them in full sentences, not just memorizing the words. Benkyou Mashou's beginner lessons, flashcards, and speaking practice are designed for exactly that.

FAQ

Do Japanese question words go at the start of the sentence?

Usually no. Put the question word where the answer would go. どこに行きますか feels natural because どこに is in the destination slot.

Do I always need か at the end?

In polite speech, yes, か is the normal question marker. In casual speech, people often drop か and use rising intonation: どこ行くの？ means "Where are you going?"

Why is it 誰が and not 誰は?

Because 誰 asks for unknown information. が identifies the missing subject. は marks a known topic, so it usually does not fit beginner "who" questions.

What is the difference between なに and なん?

They are readings of the same kanji, 何. Use なに in patterns like 何を and 何が. Use なん in common set phrases like 何ですか, 何の, 何時, and 何人.

Is なんで rude?

Not always. With friends, なんで is completely normal. With strangers, teachers, coworkers, or anyone you need to be careful with, どうして is safer.

What should I learn after question words?

Learn how particles change the question: が for "who/what is doing it," を for "what object," に for destination or location, で for action location, と for "with whom," and から/まで for from/until. The question words grammar page is a good next stop.

Keep going with beginner grammar:

• Japanese Question Words Grammar Guide
• は vs が Explained
• Japanese Particles は・が・を・に・で
• Talking About Yourself in Japanese