Kiku: Listen, Ask, Obey, and Take Effect

One sound, five kanji

Japanese has a habit of letting one verb stem carry several jobs and then using the kanji to separate them on the page. Kiku is the clearest example a learner meets early. In speech there is no difference at all, so a listener relies on the object and the particle: hanashi o kiku is listening, michi o kiku is asking, kusuri ga kiku is taking effect. When you write, the kanji does that work instead.

Grammatically kiku is a straightforward godan verb, and every sense conjugates the same way: kikimasu, kikimashita, kikanai, kiite, kiita, and the potential kikeru. That is worth saying plainly, because learners sometimes treat 効く as a separate irregular word. It is not. Kusuri ga kikimasen and hanashi o kikimasen are built by exactly the same rules from the same dictionary form.

The reason to learn the kanji anyway is reading. A menu note saying わさびが効いています tells you the wasabi is strong, and a novel writing 訊いた rather than 聞いた is signalling that a question was asked, not that a sound was heard. You do not need to write these by hand, but recognising them removes a whole class of confusion.

The sense table

Read the third column as a single block. Japanese speakers do not select kiku from a menu of meanings; they know that michi goes with kiku, that kusuri goes with kiku, and that ki goes with kiku, so the noun pulls the verb out automatically. Drill the pair, never the verb alone.

Hearing with 聞く and listening with 聴く

聞く is the default. It covers a sound arriving at your ears, listening to a person, and learning something second hand, which is why kikimashita often translates as I heard rather than I listened. If you heard it from a person, mark that person with kara or ni: tomodachi kara kikimashita is the safest pattern for reporting a rumour, because it names the source without claiming it is true.

聴く narrows the meaning to attention. Music, a concert, a lecture, a radio programme, and a friend's troubles all take 聴く when the writer wants to show that the listener leaned in. In speech nothing changes, so this only matters when you type or read. A useful test: if you could add jikkuri, meaning thoroughly, the writer would probably choose 聴く.

Asking a question with kiku

The asking sense keeps the same verb but changes the cast of the sentence. The thing you ask about takes o, and the person you ask takes ni: eki no basho o ekiin ni kikimashita. Learners often reach for shitsumon suru here, which is correct but formal and slightly heavy for everyday questions. In ordinary speech kiku is the normal verb, and shitsumon suru belongs to classrooms, meetings and forms.

One frequent mistake is marking the person with o, as though you were asking the person themselves rather than asking about something. Ten'in o kikimashita is wrong; ten'in ni kikimashita is right. Another is treating kiku as rude. It is neutral, and politeness comes from the frame around it, so kiite mo ii desu ka is perfectly polite to a stranger on the street.

Polite asking and the humble ukagau

At work the plain kiku is often softened. The humble o-kiki suru turns your asking into a modest act, and ukagau does the same job with more distance; it also means to visit and to hear, so context decides. Both are used when the person you ask outranks you, which in practice means a manager, a client, or anyone at another company.

The pattern to memorise is a soft opening plus a hedge: shitsurei desu ga, chotto ukagatte mo yoroshii deshō ka. Ending on ga or no desu ga leaves the request unfinished and lets the other person offer, which is why it sounds gentler than a complete sentence. The expected reply is hai, dōzo or nan deshō ka, so practise hearing those two as well as saying your line.

Iu koto o kiku: the obey sense

When the object is what someone says, kiku slides from listening to complying. Oya no iu koto o kikinasai is what a Japanese parent says to a child, and it means do as you are told rather than listen to your parents' voices. The same logic gives onegai o kiku, to grant a request, and jōken o kiku, to accept terms in a negotiation.

This sense is where the negative carries most of the meaning. Iu koto o kikimasen describes a child, a pet, or occasionally a machine that will not behave. Say it about an adult colleague and it sounds sharp, so keep it for family, children and light complaints about your own body: saikin, hiza ga iu koto o kikimasen.

Kusuri ga kiku: when something takes effect

効く describes something producing the effect it was meant to produce, and the thing that works takes ga. Medicine is the textbook case, but the same verb covers air conditioning, heating, a discount, an advertising campaign, and a strong seasoning. Notice that the subject is the medicine, not the patient, so you never say watashi ga kikimashita about a painkiller.

Time expressions matter here. Kiite kimashita means it has started to work, kiite imasu means it is working now, and kikimasen means it is not working at all, which is the sentence you want at a pharmacy. Pair it with a symptom and you have a complete complaint: itamidome ga kikanakute, mada itai desu.

Ki ga kiku and the faculties that work

利く is the sibling of 効く and describes a faculty, a sense or a mechanism working properly. A dog's nose, an antiques dealer's eye, a car's brakes and a young body's stamina all take 利く, always with ga. The most useful member of the family is ki ga kiku, which describes a person who notices what is needed and quietly does it. It is high praise in Japan and worth being able to give.

The adjectival form ki no kiita is used before nouns and means well judged: ki no kiita purezento, a thoughtfully chosen present. There is also kuchi o kiku, which takes o rather than ga and means to speak; mō ichi-nen kuchi mo kiite inai says two people have not spoken in a year. Treat these as set expressions rather than trying to derive them.

Kiite miru, kiite oku and other te-form moves

Most real conversation uses kiku inside a te-form pattern rather than on its own. Kiite miru means to try asking and softens a promise, because you are only going to attempt it. Kiite oku means to ask in advance so that things are ready later, which makes it the natural verb for confirming a booking or checking a rule before a trip. Both are ordinary, everyday choices rather than advanced grammar.

Kiite kara says you will listen first and decide after, kiite kureru thanks someone for listening to you, and kiite inai is the honest way to admit you were not paying attention. If you want the fuller picture of te miru and te oku as patterns, the te shimau, te oku and te miru guide covers them, but kiku is where you will use them first.

Kikoeru, kikeru and kikitoru

Three near neighbours cause trouble on the phone. Kikoeru means a sound reaches you and takes ga, so yoku kikoemasen blames the line rather than the speaker and is the polite thing to say. Kikeru is the potential of kiku and means you had the chance to listen, so nama no ensō ga kikemashita is about opportunity, not volume. Kikitoru is narrower again: it means catching the words, which is exactly what a learner cannot do when Japanese comes fast.

That distinction is worth using deliberately. Kikoemasen deshita tells someone the sound did not arrive; kikitoremasen deshita admits that you heard it and could not decode it, which invites them to slow down rather than shout. Pair the second one with a request, and the conversation repairs itself instead of stalling.

Mistakes to avoid

• Marking the person you ask with o. The person takes ni: sensei ni kikimasu, never sensei o kikimasu.
• Using shitsumon suru for every question. It is fine in a meeting and heavy in a shop, where kiite mo ii desu ka is normal.
• Saying watashi ga kusuri o kikimashita. The medicine is the subject: kusuri ga kikimashita.
• Confusing kikoemasen with kikimasen. The first says the sound is not reaching you; the second says you refuse to listen.
• Using iu koto o kikimasen about an adult colleague. It sounds like scolding a child; say nattoku shite kuremasen instead.
• Writing 聴く for asking. That kanji is only for attentive listening; asking is 聞く or, in careful writing, 訊く.