目錄
Japanese 「何の」「何を」「何が」 are all easily translated into Chinese as simply “what,” but in Japanese they are actually asking about three different positions in the sentence. 「何の本ですか」 is missing the information that comes before 「本」, 「何を読みますか」 is missing the object of 「読む」, and 「何が必要ですか」 asks which thing satisfies the condition of being 「必要」. Chinese translation hides the difference between the particles, so memorizing only one meaning, “what,” can actually make these forms easier to confuse.
A simpler way to decide is to reconstruct the ordinary sentence first. If the noun remains in the sentence, check whether the structure is 「何の＋noun」. If the original verb takes 「を」, replace the unknown part with 「何を」. With expressions such as 「好き」「欲しい」「必要」「分かる」, which commonly occur with 「が」, the interrogative likewise becomes 「何が」. The real difference between the three forms is already written in the particle that follows 「何」.
What Do Japanese 「何の」「何を」「何が」 Mean? The Difference Lies in the Particle After 「何」
「何」 is an interrogative used to ask about an unknown thing, but the particle after it determines the actual sentence structure. 「何の」 places 「何」 in a noun-modifying position; 「何を」 places the unknown thing in the object position of an action; 「何が」 indicates that the unknown item is the element marked by 「が」.
One point that needs particular attention is that 「が」 does not only mark the grammatical subject. It also appears with expressions such as 「好きだ」「欲しい」「必要だ」「分かる」「できる」「見える」. When these sentences are translated into Chinese or English, the subject relationship may not be obvious, so 「何が」 should not simply be memorized as “what is…”.
| Form | Basic Structure | Main Question Focus | Example |
|---|---|---|---|
| 「何の」 | 何の＋noun | Content, type, relationship, or purpose connected to a noun | 何の本ですか |
| 「何を」 | 何を＋verb | Object or content of an action | 何を読みますか |
| 「何が」 | 何が＋predicate | Which thing is marked by 「が」 | 何が必要ですか |
- Example: これは何の本ですか。
Kana: これはなんのほんですか。
Translation: What kind of book is this?
「何の」 directly modifies the following noun 「本」 and, depending on context, can ask about the book’s topic, content, or type. - Example: 週末に何をしますか。
Kana: しゅうまつになにをしますか。
Translation: What will you do this weekend?
「する」 requires some content for the action, and 「何を」 occupies the position where the object would normally appear. - Example: 旅行には何が必要ですか。
Kana: りょこうにはなにがひつようですか。
Translation: What do you need for a trip?
Japanese uses the pattern 「Nが必要だ」, so when the necessary item is unknown, the interrogative also appears in the 「が」 position.
How Is 「何」 Pronounced? Rules for 「なん」 and 「なに」
The pronunciation of 「何」 changes depending on what follows. 「何の」 is always pronounced 「なんの」, 「何を」 is usually pronounced 「なにを」, and 「何が」 is pronounced 「なにが」. This is also one reason the three forms are relatively easy to distinguish in actual listening.
| Form | Pronunciation | Example |
|---|---|---|
| 何の | なんの | 何の本 |
| 何を | なにを | 何を食べる |
| 何が | なにが | 何が好き |
| 何で | なんで／なにで | Depends on meaning |
| 何時 | なんじ | What time |
| 何人 | なんにん | How many people |
The particle 「を」 in 「何を」 is generally pronounced close to 「お」 in modern Japanese, so in actual speech 「なにを」 sounds close to 「なにお」. It must still be written as 「何を」.
- Example: 何の映画を見ましたか。
Kana: なんのえいがをみましたか。
Translation: What movie did you watch?
「何の」 is pronounced 「なんの」, and the noun 「映画」 remains in the sentence. - Example: 昨日、何を買いましたか。
Kana: きのう、なにをかいましたか。
Translation: What did you buy yesterday?
「何を」 is pronounced 「なにを」, while 「を」 sounds close to 「お」 in actual speech. - Example: この中で何が一番安いですか。
Kana: このなかでなにがいちばんやすいですか。
Translation: Which thing is the cheapest among these?
「何が」 is pronounced 「なにが」, and the unknown element is whichever item satisfies the condition 「一番安い」.
How to Use 「何の」: Keep the Noun and Ask About Content, Type, Relationship, or Purpose
The basic structure of 「何の」 is 「何の＋noun」. The sentence already establishes what category of noun the answer belongs to, but the information that should come before that noun is unknown.
For this reason, 「何の」 does not only mean “what kind of.” It can ask about content, source, purpose, or relationship and also appears in fixed expressions such as 「何のため」. Its exact meaning has to be interpreted together with the noun that follows.
「何の」 Usage ①｜Asking About the Type or Content of a Noun
When the following noun is already established, 「何の」 can further ask what type it is or what it is related to. Books, movies, dishes, photographs, and sounds are all common examples.
- Example: それは何の本ですか。
Kana: それはなんのほんですか。
Translation: What kind of book is that?
Depending on the context, answers such as 「日本史の本です」 or 「料理の本です」 can specify the book’s topic or type. - Example: 何の映画を見ていますか。
Kana: なんのえいがをみていますか。
Translation: What movie are you watching?
The category 「映画」 has already been established, and 「何の」 asks which movie or what type of movie it is. - Example: これは何の料理ですか。
Kana: これはなんのりょうりですか。
Translation: What kind of dish is this?
When looking at an unfamiliar dish, this can be used to ask about the type of cuisine, main ingredient, or name of the dish.
「何の」 Usage ②｜Asking About Source, Content, or Relationship
「何の」 forms an 「AのB」 structure with the following noun, except that the original A has been replaced by an unknown item. Expressions such as 「雨の音」「旅行の写真」「仕事の話」 can therefore be turned directly into questions.
- Example: 外から聞こえるのは何の音ですか。
Kana: そとからきこえるのはなんのおとですか。
Translation: What is that sound coming from outside?
Possible answers include 「工事の音です」 or 「車の音です」. The unknown information is the source of the sound. - Example: それは何の写真ですか。
Kana: それはなんのしゃしんですか。
Translation: What is that a photo of?
Answers such as 「旅行の写真です」 or 「家族の写真です」 supply the content or relationship of the photograph. - Example: さっき何の話をしていたんですか。
Kana: さっきなんのはなしをしていたんですか。
Translation: What were you talking about earlier?
「仕事の話」 and 「旅行の話」 both follow the original 「Aの話」 structure, so the interrogative form becomes 「何の話」.
「何の」 Usage ③｜The Fixed Expression 「何のために」 for Asking About Purpose
「ため」 itself is a noun, so 「何のため」 still belongs to the structure 「何の＋noun」. 「何のために」 means “for what purpose” and is commonly used to ask about the purpose behind an action.
- Example: 何のために日本語を勉強していますか。
Kana: なんのためににほんごをべんきょうしていますか。
Translation: What are you studying Japanese for?
「何の」 modifies the noun 「ため」, and the whole expression asks about the purpose of studying Japanese. - Example: この書類は何のために必要ですか。
Kana: このしょるいはなんのためにひつようですか。
Translation: What is this document needed for?
This is useful in application, administrative, or workplace situations when confirming the purpose of a document. - Example: このボタンは何のためにあるんですか。
Kana: このぼたんはなんのためにあるんですか。
Translation: What is this button for?
「何のため」 can also be used when asking about the function of equipment.
How to Use 「何を」: Asking About the Object of Actions Such as Eating, Watching, Buying, and Doing
「何を」 is easiest to identify from the verb. If the original structure is 「Nを＋verb」, replacing the unknown N with 「何」 gives 「何を＋verb」.
Transitive verbs such as 「食べる」「飲む」「買う」「読む」「見る」「作る」「聞く」「する」 commonly take 「を」. These sentences are asking what thing the action is directed at.
「何を」 Usage ①｜Asking About the Object of Eating, Buying, Watching, and Similar Actions
The position of 「何を」 becomes easiest to understand if you first turn an ordinary sentence into a question.
「パンを食べます」→「何を食べますか」
「本を読みます」→「何を読みますか」
- Example: 朝ごはんに何を食べましたか。
Kana: あさごはんになにをたべましたか。
Translation: What did you eat for breakfast?
The object of 「食べる」 is unknown, so the original food item is replaced by 「何を」. - Example: 駅で何を買いましたか。
Kana: えきでなにをかいましたか。
Translation: What did you buy at the station?
「駅で」 indicates the place of purchase, while 「何を」 asks what was bought. - Example: 今、何を読んでいますか。
Kana: いま、なにをよんでいますか。
Translation: What are you reading now?
The answer can directly restore the original object, as in 「小説を読んでいます」.
「何を」 Usage ②｜Asking What Someone Did or Plans to Do
The content before 「する」 is often marked by 「を」, making 「何をしますか」 a very common everyday question. It can be used for weekend plans, work tasks, and activity schedules.
- Example: 週末は何をしますか。
Kana: しゅうまつはなにをしますか。
Translation: What will you do this weekend?
The unknown element is the activity planned for the weekend. Possible answers include 「買い物をします」 or 「映画を見ます」. - Example: 旅行中は何をしたいですか。
Kana: りょこうちゅうはなにをしたいですか。
Translation: What do you want to do during the trip?
「何をする」 develops into 「何をしたい」, asking what activity the person wants to do. - Example: 昨日の会議で何を話しましたか。
Kana: きのうのかいぎでなにをはなしましたか。
Translation: What did you talk about in yesterday’s meeting?
「何を」 asks about the content of the conversation, which is completely different from 「誰が話しましたか」, which asks who spoke.
「何を」 Usage ③｜Other Particles Can Appear in the Same Sentence
Seeing particles such as 「に」「で」「と」 does not mean 「何を」 cannot also appear. Different particles simply mark different sentence elements.
- Example: 店員さんに何を聞きましたか。
Kana: てんいんさんになにをききましたか。
Translation: What did you ask the store clerk?
「店員さんに」 marks the person who was asked, while 「何を」 marks what was asked. - Example: 友達と何を話しましたか。
Kana: ともだちとなにをはなしましたか。
Translation: What did you talk about with your friend?
「友達と」 indicates the person involved in the conversation, while 「何を」 indicates the content of the conversation. - Example: この材料で何を作りますか。
Kana: このざいりょうでなにをつくりますか。
Translation: What will you make with these ingredients?
「で」 marks the materials being used, while 「何を」 asks what will ultimately be made.
How to Use 「何が」: Why Do 「好き」「必要」「できる」 All Use 「が」?
「何が」 is very easily oversimplified as simply 「何＋subject particle が」. That explanation works for sentences such as 「何が落ちましたか」 and 「何がありますか」, but it becomes less useful with sentences such as 「何が好きですか」 and 「何が欲しいですか」.
A more reliable method is to first check which particle the original sentence pattern uses. If the basic pattern is 「Nが好きだ」「Nが必要だ」「Nが見える」, replacing the unknown N with 「何」 naturally gives 「何が」.
「何が」 Usage ①｜Asking Which Thing Is in a Certain State
Expressions such as 「ある」「必要だ」「人気だ」「一番安い」 use 「が」 to mark the thing being discussed, so the interrogative likewise takes 「が」.
- Example: 教室に何がありますか。
Kana: きょうしつになにがありますか。
Translation: What is in the classroom?
The basic pattern is 「机があります」. Replacing 「机」 with an unknown item produces 「何がありますか」. - Example: 旅行には何が必要ですか。
Kana: りょこうにはなにがひつようですか。
Translation: What do you need for a trip?
The basic structure is 「パスポートが必要です」, so the question also keeps 「が」. - Example: この店では何が人気ですか。
Kana: このみせではなにがにんきですか。
Translation: What is popular at this shop?
「この店では」 first limits the scope, while 「何が」 asks which product or dish is popular within that scope.
「何が」 Usage ②｜The Object of 「好き」「欲しい」 and Similar Expressions Often Uses 「が」
In Chinese or English, coffee in “I like coffee” and a new phone in “I want a new phone” may look like verb objects. In Japanese, however, 「好きだ」 is a な-adjective and 「欲しい」 is an い-adjective, and their basic patterns are usually 「Nが好きだ」 and 「Nが欲しい」.
Therefore, “What do you like?” is not 「何を好きですか」 but 「何が好きですか」.
- Example: 日本料理では何が好きですか。
Kana: にほんりょうりではなにがすきですか。
Translation: What Japanese food do you like?
The object of 「好き」 is marked by 「が」, so the interrogative also becomes 「何が」. - Example: 誕生日に何が欲しいですか。
Kana: たんじょうびになにがほしいですか。
Translation: What do you want for your birthday?
The basic pattern is 「新しい靴が欲しいです」, so the question becomes 「何が欲しいですか」. - Example: この中では何が一番好きですか。
Kana: このなかではなにがいちばんすきですか。
Translation: Which one of these do you like best?
The range has already been limited by 「この中では」, and the unknown item is whichever one satisfies 「一番好き」.
「何が」 Usage ③｜「見える」「分かる」「できる」 Also Commonly Use 「が」
「見える」 means that something comes naturally into view, 「分かる」 means that something is understood, and 「できる」 can express the ability to do something. These verbs and expressions commonly use 「が」 to mark what is visible, understandable, or possible.
- Example: 窓から何が見えますか。
Kana: まどからなにがみえますか。
Translation: What can you see from the window?
「見る」 means actively looking, while 「見える」 means something naturally enters your field of vision, so 「何が見えますか」 is used. - Example: この説明を読んで、何が分かりましたか。
Kana: このせつめいをよんで、なにがわかりましたか。
Translation: What did you understand after reading this explanation?
「何が」 asks about the content that became understood. - Example: このアプリでは何ができますか。
Kana: このあぷりではなにができますか。
Translation: What can you do with this app?
「何ができる」 asks what functions are possible and is common in product or service descriptions.
Japanese 「何の」「何を」「何が」 Compared: Changing the Particle Changes the Focus of the Question
The three forms are easiest to understand when compared within the same topic. Using “books” as an example, 「何の本ですか」 keeps the noun 「本」 and asks about its content or type; 「何を読みますか」 directly asks about the object being read; 「何が面白いですか」 asks which thing satisfies the condition of being 「面白い」.
| Question | What It Really Asks | Example Answer |
|---|---|---|
| 何の本ですか | The book’s content or type | 日本史の本です |
| 何を読みますか | What is being read | 日本史の本を読みます |
| 何が面白いですか | Which thing is interesting | この本が面白いです |
▌「何の」 vs 「何を」: Does the Noun Remain in the Sentence?
「何の」 must be followed by the noun it modifies. 「何を」 directly occupies the object position of the verb. The two questions may sometimes receive similar answers, but their scopes are different.
❌ Unnatural: 何を映画を見ますか。
✅ Correct: 何の映画を見ますか。
✅ Correct: 何を見ますか。
「何の映画を見ますか」 already establishes that the answer is a movie and only asks which movie or type of movie. 「何を見ますか」 does not limit the answer in advance, so it could be a movie, television program, exhibition, or sporting event.
▌「何を」 vs 「何が」: First Check Which Particle the Original Pattern Uses
Chinese and English “what” do not reveal the Japanese particle, so translating directly can easily lead to mistakes. A more reliable method is to reconstruct the ordinary sentence first.
「寿司を食べます」→「何を食べますか」
「寿司が好きです」→「何が好きですか」
「寿司が人気です」→「何が人気ですか」
❌ Unnatural: 何を好きですか。
✅ Correct: 何が好きですか。
「好き」 does not use the ordinary transitive-verb structure “like something.” Its basic pattern is 「Nが好きだ」, so you cannot simply copy the object marker 「を」 from the English or Chinese translation “like what.”
▌「何の」 and 「何が」 Can Appear in the Same Sentence
「の」 and 「が」 perform different functions, so they can naturally appear together in the same noun phrase and sentence.
- Example: 何の料理が人気ですか。
Kana: なんのりょうりがにんきですか。
Translation: What kind of food is popular?
「何の」 first modifies 「料理」, and the entire phrase 「何の料理」 is then connected to 「人気だ」 with 「が」. - Example: 何の音が聞こえますか。
Kana: なんのおとがきこえますか。
Translation: What sound can you hear?
「何の」 asks about the source or type of sound, while 「音が」 is the element marked by 「が」 with 「聞こえる」. - Example: 何の機能が必要ですか。
Kana: なんのきのうがひつようですか。
Translation: What kind of function is needed?
「何の機能」 asks about the type of function, and the entire noun phrase then connects to 「が必要だ」.
Which Is Correct: 「何が食べたい」 or 「何を食べたい」?
Both 「何が食べたいですか」 and 「何を食べたいですか」 are possible. One should not simply be labeled correct and the other incorrect.
「〜たい」 is formed from a verb, so the original object marker 「を」 can remain, as in 「ラーメンを食べたい」. On the other hand, when the desired object is foregrounded, 「が」 is also commonly used, so 「ラーメンが食べたい」 is equally natural. Both forms are heard in actual conversation.
Japan Foundation materials use 「何が食べたいですか」 as an example for asking what someone wants to eat, while 「何を食べたいですか」 is also common in other Japanese learning materials and actual conversation.
| Expression | Natural? | General Nuance |
|---|---|---|
| 何が食べたいですか | ✅ | Focus more readily falls on the thing the person wants to eat |
| 何を食べたいですか | ✅ | Retains the action structure 「食べる＋を」 |
| 何食べたい？ | ✅ Casual | Particle omitted, very common among friends |
- Example: 今日は何が食べたいですか。
Kana: きょうはなにがたべたいですか。
Translation: What do you want to eat today?
「が」 places the focus on the desired food and is common in both teaching materials and ordinary conversation. - Example: 旅行先で何を食べたいですか。
Kana: りょこうさきでなにをたべたいですか。
Translation: What do you want to eat while traveling?
「を」 preserves the original object relationship of 「食べる」 and is equally natural. - Example: 晩ご飯、何食べたい？
Kana: ばんごはん、なにたべたい。
Translation: What do you want for dinner?
Particles are often omitted entirely in casual conversation, so actual speech does not necessarily contain the full 「何が」 or 「何を」.
The same rule cannot simply be applied to 「好き」.
❌ 何を好きですか。
✅ 何が好きですか。
This is because 「好き」 is not a transitive verb like 「食べる」, so 「何を好きですか」 cannot be explained through the 「を／が」 alternation found with 「〜たい」.
What Is the Difference Between 「何の」 and 「どんな」? Both Can Mean “What Kind of,” but They Ask Different Things
「何の＋noun」 mainly asks what content, type, purpose, or object a noun is related to, while 「どんな＋noun」 tends to ask about qualities, characteristics, and what something is like.
For example, 「何の本ですか」 may ask whether a book is about cooking, travel, or history, while 「どんな本ですか」 may be answered with 「読みやすい本です」 or 「写真が多い本です」.
| Expression | Main Focus | Example Answer |
|---|---|---|
| 何の本ですか | Topic, content, type | 料理の本です |
| どんな本ですか | Qualities, characteristics | 写真が多い本です |
| 何の映画ですか | Work, subject, genre | ホラー映画です |
| どんな映画ですか | Characteristics of the movie | 少し怖い映画です |
▌When Asking What Kind of Manga Someone Likes, 「どんな」 Is Usually More Natural Than 「何の」
△ 何のマンガが好きですか。
✅ どんなマンガが好きですか。
When broadly asking what kinds, themes, or styles of manga someone prefers, 「どんなマンガが好きですか」 is usually more natural. 「何のマンガ」 more readily makes the listener expect a specific title, series, or clearly defined category.
▌When Asking About the Type of Company, 「どんな会社」 Is Also Common
△ 何の会社で働いていますか。
✅ どんな会社で働いていますか。
When asking what industry a company belongs to or what kind of business it does, 「どんな会社で働いていますか」 is more natural. Possible answers include 「機械を作る会社です」 or 「旅行会社です」.
▌To Ask Someone’s Favorite Color, Do Not Say 「何の色」
❌ 何の色が好きですか。
✅ 何色が好きですか。
Japanese normally uses the compound interrogative 「何色（なにいろ）」 for “what color.” Expressions like this should not automatically be turned into 「何の」 just because the translation contains “what.”
- Example: 何色が好きですか。
Kana: なにいろがすきですか。
Translation: What color do you like?
「何色」 itself means “what color,” and the following 「が」 connects it to 「好き」.
Common Mistakes With Japanese 「何の」「何を」「何が」: Reconstructing the Ordinary Sentence Is Faster Than Memorizing the Translation
The main reason these three forms are confused is that Chinese and English often reduce all of them to a single word, “what.” Japanese, however, requires you to first decide whether the interrogative is modifying a noun, functioning as an object, or filling a position marked by 「が」.
▌Mistake ①: 「何が本ですか」
❌ 何が本ですか。
✅ 何の本ですか。
The question is asking about the content or type that comes before 「本」, so it needs 「何の」, which can modify a noun.
▌Mistake ②: 「何を好きですか」
❌ 何を好きですか。
✅ 何が好きですか。
The basic pattern of 「好き」 is 「Nが好きだ」. When the thing being liked is unknown, replace N with 「何」.
▌Mistake ③: 「何をありますか」
❌ 何をありますか。
✅ 何がありますか。
「ある」 indicates that something exists, and the thing that exists is marked by 「が」. For example, 「机があります」 becomes 「何がありますか」 when turned into a question.
▌Mistake ④: Automatically Using 「何を」 Whenever the Translation Says “What Food”
❌ 何を料理が好きですか。
✅ 何の料理が好きですか。
✅ どんな料理が好きですか。
If 「料理」 remains in the sentence, it first needs to be modified by 「何の」 or 「どんな」. The whole phrase 「何の料理／どんな料理」 then connects to 「が好きですか」.
▌Mistake ⑤: Interpreting Every 「何が」 as a Chinese or English Subject
「何が落ちましたか」 genuinely asks “What fell?”, but forcing 「何が好きですか」 into something like “What is liked?” makes it harder to understand.
With 「好き」「欲しい」「必要」「分かる」「できる」「見える」, it is more practical to remember the original particle pattern directly.
「何の」「何を」「何が」 in Japanese Travel and Everyday Conversation
「何」 appears constantly in restaurants, shops, hotels, and casual conversations with friends. In actual speech, people do not consciously analyze subjects and objects every time, but the questions still follow the same structures. Checking what word remains after 「何」 usually makes the correct particle easier to identify.
▌Situation ①｜Asking About a Dish and Ordering at a Restaurant
A：これは何の料理ですか。
Kana: これはなんのりょうりですか。
What kind of dish is this?
B：鶏肉を使った料理です。何を注文しますか。
Kana: とりにくをつかったりょうりです。なにをちゅうもんしますか。
It’s a dish made with chicken. What would you like to order?
📌 Grammar Point: 「何の料理」 asks what type or content the dish has, while 「何を注文する」 directly asks about the object of the ordering action.
▌Situation ②｜Asking About Popular Products in a Shop
A：この店では何が一番人気ですか。
Kana: このみせではなにがいちばんにんきですか。
What is the most popular item in this shop?
B：このバッグが人気です。何色がいいですか。
Kana: このバッグがにんきです。なにいろがいいですか。
This bag is popular. What color would you like?
📌 Grammar Point: 「何が人気」 asks which product satisfies the condition 「人気」. For color, Japanese directly uses 「何色」 rather than 「何の色」.
▌Situation ③｜Talking With a Friend About Hobbies
A：休みの日は何をしていますか。
Kana: やすみのひはなにをしていますか。
What do you usually do on your days off?
B：映画を見ています。日本映画では何が好きですか。
Kana: えいがをみています。にほんえいがではなにがすきですか。
I watch movies. Which Japanese movies do you like?
📌 Grammar Point: 「何をしていますか」 asks about the activity being done, while 「何が好きですか」 uses the structure 「Nが好きだ」 to ask about the preferred item.
Cultural Notes:
- Particles are often omitted in everyday conversation, so forms such as 「何食べる？」「何買った？」「何好き？」 are commonly heard. Omission does not mean the particle rules disappear; it simply means the context is clear enough. In formal writing or while first learning sentence structure, keeping the particles makes the grammar easier to see.
- 「何が好きですか」 and 「どんな〜が好きですか」 ask about different ranges. The former can ask completely openly what someone likes, while the latter first limits the question to a certain noun category and then asks about preferred characteristics or types, as in 「どんな映画が好きですか」.
- 「何の」 is not the only way to translate every “what + noun” expression. Color uses 「何色」, time uses 「何時」, and the number of people uses 「何人」. When Japanese already has a fixed interrogative form, 「の」 is not added separately.
How Do Japanese 「何の／何を／何が」 Compare With Korean 「무슨／무엇을／무엇이」?
Japanese 「何」 combines with particles such as 「の」「を」「が」 according to its function in the sentence. 「何の＋noun」 asks about the type or content of a noun, 「何を＋verb」 asks about the object of an action, and 「何が」 asks about the subject, necessary item, or thing presenting a certain state.
Korean also chooses different forms according to sentence structure. 「무슨」 appears directly before a noun and functions similarly to Japanese 「何の＋noun」. 「무엇을／뭘」 and 「무엇이／뭐가」 are respectively marked by the particles 「을／를」 and 「이／가」. However, the parts of speech and particle systems of the two languages are not completely identical, so the correct form cannot be determined from the Chinese or English translation alone.
◆ Similar Expression ①: Korean 「무슨＋Noun」
Korean 「무슨」 appears directly before a noun and asks about the type, characteristics, or specific content of something, overlapping considerably with Japanese 「何の＋noun」. However, Japanese 「何の」 consists of the interrogative 「何」 plus the particle 「の」, while Korean 「무슨」 does not require an additional particle before the noun.
- Example: 무슨 책이에요?
Romanization: mu-seun chae-gi-e-yo?
Translation: What kind of book is this?
Corresponds to Japanese 「何の本ですか」. Korean places 「무슨」 directly before 「책」, while Japanese uses 「何の」 to modify 「本」. - Example: 무슨 영화를 보고 싶어요?
Romanization: mu-seun yeong-hwa-reul bo-go si-peo-yo?
Translation: What movie do you want to watch?
Corresponds to Japanese 「何の映画が見たいですか」. Both sentences ask about the type or title of movie the person wants to watch. - Example: 이건 무슨 소리예요?
Romanization: i-geon mu-seun so-ri-ye-yo?
Translation: What is that sound?
Corresponds to Japanese 「これは何の音ですか」. The question is not asking what the sound “does,” but rather what kind of sound it is or where it comes from.
◆ Similar Expression ②: Korean 「무엇을／뭘＋Verb」
「무엇을」 consists of the interrogative 「무엇」 and the object particle 「을」 and is usually contracted to 「뭘」 in conversation. When “what” is the object of actions such as eating, buying, doing, or watching, its function is close to Japanese 「何を＋verb」.
- Example: 점심으로 뭘 먹어요?
Romanization: jeom-si-meu-ro mwol meo-geo-yo?
Translation: What are you eating for lunch?
Corresponds to Japanese 「お昼に何を食べますか」. Korean 「뭘」 and Japanese 「何を」 both occupy the object position of the action “eat.” - Example: 지금 무엇을 하고 있어요?
Romanization: ji-geum mu-eo-seul ha-go i-sseo-yo?
Translation: What are you doing now?
Corresponds to Japanese 「今、何をしていますか」. The full form 「무엇을」 is slightly more formal than conversational 「뭘」, but both have the same syntactic function. - Example: 주말에 뭘 살 거예요?
Romanization: ju-ma-re mwol sal geo-ye-yo?
Translation: What are you going to buy this weekend?
Corresponds to Japanese 「週末に何を買いますか」. Both languages use an object particle to mark the thing involved in the action “buy.”
◆ Similar Expression ③: Korean 「무엇이／뭐가＋State or Predicate」
「무엇이」 consists of 「무엇」 and the subject particle 「이」 and is frequently contracted to 「뭐가」 in conversation. When the sentence asks what is necessary, important, or in a certain state, it can often be understood alongside Japanese 「何が」.
- Example: 여행에는 뭐가 필요해요?
Romanization: yeo-haeng-e-neun mwo-ga pi-ryo-hae-yo?
Translation: What do you need for a trip?
Corresponds to Japanese 「旅行には何が必要ですか」. Both Korean and Japanese use a subject particle to mark the item judged to be necessary. - Example: 무엇이 가장 중요해요?
Romanization: mu-eo-si ga-jang jung-yo-hae-yo?
Translation: What is the most important?
Corresponds to Japanese 「何がいちばん大切ですか」. The full form 「무엇이」 is more common in formal questions or writing, while everyday conversation usually uses 「뭐가 가장 중요해요?」. - Example: 뭐가 문제예요?
Romanization: mwo-ga mun-je-ye-yo?
Translation: What’s the problem?
Corresponds to Japanese 「何が問題ですか」. Both sentences use a subject particle to ask what thing or factor is regarded as the problem.
◆ Core Differences Between Japanese and Korean Interrogatives and Particles:
Japanese 「何の」「何を」「何が」 are all formed by combining the interrogative 「何」 with different particles. Korean instead uses 「무슨」 directly before a noun and forms 「무엇을／뭘」 and 「무엇이／뭐가」 by combining 「무엇／뭐」 with 「을／를」 and 「이／가」. 「何を」 and 「무엇을／뭘」, as well as 「何が」 and 「무엇이／뭐가」, can be directly compared in many sentences. However, when expressions belong to different parts of speech in the two languages, such as Japanese 「好きだ」 and Korean 「좋아하다」, the particles they use will also differ. To choose the correct particle, you need to check the predicate structure in Japanese and Korean rather than replacing the Chinese or English word “what” mechanically.
The difference between 「何の」「何を」「何が」 ultimately comes down to what the particle normally does in the sentence. 「何の」 appears before a noun and supplies information about it, 「何を」 fills the position in 「Nを＋verb」, and 「何が」 follows predicates whose original pattern uses 「が」. When you encounter 「何が好きですか」, working backward from 「コーヒーが好きです」 is much easier than trying to translate 「が」 as a subject marker in English.
The form that deserves a little extra attention is 「〜たい」. Both 「何が食べたいですか」 and 「何を食べたいですか」 are possible, so this is not a case where one should be labeled correct and the other wrong. First check which particle the original verb takes, then consider which element the sentence is bringing into focus. Doing this makes it much easier to avoid mixing 「の」「を」「が」 together simply because they can all be translated as “what.”
FAQ
First look at the position occupied by 「何」. 「何の」 is followed by a noun and asks about the noun’s content, type, or relationship. 「何を」 usually appears with a transitive verb and asks about the object of the action. 「何が」 fills a position that would normally be marked by 「が」. Reconstructing the ordinary sentence is more reliable than directly translating everything as “what.”
Because Japanese 「好きだ」 is not an ordinary transitive verb. Its basic pattern is 「Nが好きだ」. For example, when 「音楽が好きです」 is turned into a question and the unknown 「音楽」 is replaced by 「何」, the result is 「何が好きですか」. 「何を好きですか」 is not the standard basic form.
Both can be used. 「〜たい」 can preserve the original object of the verb, producing 「何を食べたいですか」, while the desired item can also be marked with 「が」, producing 「何が食べたいですか」. In everyday conversation, the particle is also frequently omitted entirely, resulting in 「何食べたい？」.
「何の」 more commonly asks what content, type, purpose, or object a noun is related to, while 「どんな」 focuses more on qualities and characteristics. 「何の本ですか」 can be answered with 「料理の本です」, while 「どんな本ですか」 is better suited to an answer such as 「写真が多い本です」.
Japanese has the fixed interrogative 「何色（なにいろ）」, so you say 「何色が好きですか」. Likewise, “what time” uses 「何時（なんじ）」 and “how many people” uses 「何人（なんにん）」. Not every Chinese or English “what + noun” expression becomes 「何の＋noun」 in Japanese.