Saying What You Want in Japanese: Tai, Hoshii, and Tagaru

Four ways to want something

Before any conjugation, decide what kind of wanting you mean. If you want to perform an action yourself, the verb takes tai. If you want to possess or receive a thing, the adjective hoshii does the job. If you are talking about a third person, you switch to tagaru or to reported speech, because Japanese does not let you assert what is inside somebody else's head. And if you want another person to do something, the verb goes into the te form and picks up hoshii.

Choosing wrongly is not a small slip. Hon ga hoshii desu and hon o yomitai desu are different wishes, and kare wa ikitai desu sounds to a Japanese ear like a claim you cannot make. The table below is the map; the rest of the post fills in the forms and the register.

Building the tai form from the masu stem

The tai form starts from the masu stem, which is what is left when you remove masu from the polite form. Ikimasu gives iki, tabemasu gives tabe, shimasu gives shi. Add tai and you have an adjective: ikitai, tabetai, shitai. Because the stem is involved, the rule works identically for godan verbs, ichidan verbs, and both irregulars, which is why it is worth learning the masu form of a new verb even if you plan to speak plainly.

The result is not a verb any more. Ikitai behaves like an i-adjective such as takai, so the past is ikitakatta, the negative is ikitakunai, and the past negative is ikitakunakatta. Attach desu to any of them for polite speech. Learners often try to say ikitai deshita or ikitaimasen; both are wrong, because the tense lives in the adjective ending, not in desu.

Note the reading of the last row. Kuru changes vowel in the stem, so the tai form is kitai, written 来たい and pronounced ki-tai, not ku-tai. This is the same stem that gives kimasu.

Tai in real sentences

In conversation the tai form usually appears with desu for politeness and often carries a time word or a place, exactly like any other adjective sentence. The past form is what you use to describe a wish you had, including one that was never fulfilled, so kaeritakatta desu covers both I wanted to go home and I would have liked to go home.

The plain forms drop desu: ikitai, tabetakunai, kaeritakatta. Use them with friends and inside longer sentences, for example ikitai kedo jikan ga arimasen, meaning I want to go but I do not have time.

O or ga with the tai form

When the verb has an object, you may keep the usual o or switch it to ga. Mizu o nomitai desu and mizu ga nomitai desu are both natural. Ga puts the spotlight on the thing itself and feels more emotional, which is why hungry people say rāmen ga tabetai. O sounds more neutral and is the safer choice in long sentences, in writing, and when the object already carries a long modifier.

The one rule worth respecting is consistency inside a single clause: choose one marker and do not swap halfway. Ga also cannot appear when the object is separated from the verb by other elements, so as your sentences get longer, o becomes the default without you having to think about it.

Hoshii: wanting a thing

Hoshii is an i-adjective, not a verb, and the thing you want is marked with ga rather than o. That is the single most common mistake with this pattern. Because it is an i-adjective it conjugates like tai: hoshikunai, hoshikatta, hoshikunakatta, each with desu for polite speech. Hoshii desu is correct; hoshii deshita is not.

Hoshii is for objects and for abstract things you can receive, such as time, information, or a break. If what you want is an action you will perform, hoshii is the wrong pattern and the verb should take tai instead. Compare kuruma ga hoshii desu, I want a car, with unten shitai desu, I want to drive.

Who may be the subject

This is the rule that separates a learner sentence from a natural one. Tai and hoshii state an inner feeling as a fact, so they are used for yourself, or for the listener inside a question. Saying kare wa ikitai desu asserts knowledge of another person's mind and sounds wrong, in the same way that reporting a stranger's thoughts as certainty sounds odd in English.

The last column of that table is the shortcut. If you are unsure whether tagaru fits, quote the person instead. Nobody will fault you for saying Tanaka-san wa yasumitai to itte imashita.

Talking about what someone else wants

Tagaru is built from the same masu stem: iki plus tagaru gives ikitagaru, tabe plus tagaru gives tabetagaru. It is a godan verb, so it conjugates normally, and in practice it almost always appears in the te iru form, ikitagatte imasu, because you are describing an ongoing outward sign rather than a single event. The noun equivalent is hoshigaru, and it takes o where hoshii took ga.

Tagaru carries a faint sense of observing from outside, and with a superior it can sound distant or even a little dismissive, so keep it for children, friends, family, and general statements. For a boss or a client, report their words or hedge with yō desu or sō desu instead.

Softening a wish for a superior

Tai desu is grammatically polite but pragmatically blunt, because it announces your wish and leaves the other person to deal with it. Japanese usually adds distance. To omoimasu turns the wish into a thought, so yasumi o toritai to omoimasu means something closer to I am thinking of taking leave. Attaching n desu ga leaves the sentence hanging and hands the decision over, which is why so many workplace requests trail off before the verb.

For anything you want the other person to do, climb one more step: itadakitai no desu ga is the humble form and is standard when addressing a manager or a client. Compare tetsudatte hoshii desu, which is fine among colleagues at the same level, with tetsudatte itadakitai no desu ga, which is what you say upward.

A likely reply is hai, daijōbu desu yo, meaning yes, that is fine, or nan deshō ka, meaning what is it. Both invite you to continue, so plan the second sentence before you open your mouth.

Asking what someone wants

Nani ga tabetai desu ka is normal with friends and with people at your own level. Aimed upward or at a customer it can feel like an interrogation, so service Japanese asks about preference instead of desire, and often about the existence of a wish rather than its content. Nani ka hoshii mono wa arimasu ka is gentler than nani ga hoshii desu ka for exactly this reason.

Useful answers to have ready: nan demo ii desu, anything is fine; omakase shimasu, I leave it to you; and chotto kangaesasete kudasai, please let me think for a moment.

Saying you do not want something

The negative is simply the i-adjective negative, ikitakunai desu or ikitaku arimasen, the second being slightly more formal. Said bare, a negative wish is quite strong, so spoken Japanese blunts it with amari, chotto, or a trailing kedo. Chotto is the workhorse: chotto ikitakunai desu ne says no while leaving the atmosphere intact.

Te hoshii: wanting someone else to act

Take the te form of the verb and add hoshii, and you have a wish directed at another person: tetsudatte hoshii desu, I want you to help. The person who is meant to act is marked with ni, as in Tanaka-san ni kite hoshii desu. For a negative, use the nai de form: shinpai shinaide hoshii desu, I want you not to worry.

Register matters here more than anywhere else in this post, because te hoshii states what you want from someone. Among friends and equals it is normal. Upward, move to shite itadakitai no desu ga, or drop the wish entirely and use a request form such as shite itadakemasen ka. The te-form guide on this blog covers how each of those te forms is built.

Shite moraitai and shite hoshii are close in meaning; moraitai focuses slightly more on receiving the favour and is a shade more measured, which makes it a comfortable middle step between casual and humble speech.