Expressing Modality: Overview | Ukrainian Grammar

English packs can, must, should, may, will into tidy one-word auxiliaries that slot in front of a bare verb: I can swim, you must go, we should leave. Ukrainian has nothing like this. There is no single "can," no single "must," no single "should." Instead, Ukrainian spreads the work of modality across a mix of full verbs and impersonal predicatives, and — crucially — many of them put the person in the dative, not the nominative. This page is the map: it shows which tool covers which meaning, why English "can" and "must" each split into two or three Ukrainian words, and how the dative experiencer runs through the whole system. Each tool then gets its own detailed page.

The big picture: a toolkit, not an auxiliary

Hold onto two organising ideas and the rest follows.

English single words split into several Ukrainian words. "Can" = могти́ (circumstance permits) or вмі́ти (you have the skill). "Must" = тре́ба (impersonal need) or му́сити (you're compelled) or пови́нен (you ought to). Choosing among them is the skill.
Most necessity/permission is impersonal, with a dative experiencer. "I need to go" is Мені́ тре́ба йти (literally "to-me [it is] necessary to go"), not a sentence with "I" as subject. This ties modality directly to impersonal constructions.

Meaning	Ukrainian tool	Type	Subject of person
can (circumstance)	могти́ + inf.	verb	nominative (я мо́жу)
can (skill)	вмі́ти / умі́ти + inf.	verb	nominative (я вмі́ю)
need / must	тре́ба + inf.	predicative	dative (мені́ тре́ба)
must (compelled)	му́сити + inf.	verb	nominative (я му́шу)
ought / must	пови́нен + inf.	agreeing adjective	nominative (я пови́нен)
should	слід + inf.	predicative	dative (вам слід)
may (permission)	мо́жна + inf.	predicative	dative / none
want	хоті́ти + inf.	verb	nominative (я хо́чу)
feel like	хоті́тися + inf.	impersonal	dative (мені́ хо́четься)

Ability: могти́ vs вмі́ти — two kinds of "can"

This is the split English speakers stumble over most. Both translate as "can," but they answer different questions:

могти́ (можу́, мо́жеш, мо́же...) = "can" in the sense of circumstances allow / am able right now. The road is clear, you have time, you're permitted, you're physically up to it.
вмі́ти / умі́ти (вмі́ю, вмі́єш...) = "can" in the sense of know how to / have the learned skill. Swimming, cooking, driving, speaking a language — things you were taught.

Я мо́жу прийти́ о шо́стій, ра́ніше не вихо́дить.

I can come at six, earlier doesn't work. (мо́жу — circumstances/availability, not a skill.)

Я вмі́ю готува́ти лише́ яє́шню та макаро́ни.

I can only cook scrambled eggs and pasta. (вмі́ю — a learned skill; могти́ would be wrong here.)

Вона́ вмі́є пла́вати, але́ сього́дні не мо́же — заши́ли но́гу.

She can swim, but she can't today — they stitched up her leg. (вмі́є = skill; не мо́же = circumstance — both 'can' in English, two different verbs here.)

The могти́/вмі́ти distinction is detailed on могти́ vs вмі́ти; the high-frequency verb могти́ also has its own reference page, where the г→ж mutation (можу́, мо́жеш) lives.

Necessity: тре́ба, му́сити, пови́нен — three strengths of "must"

English "must / have to / need to" maps onto three different Ukrainian tools that differ in register, force, and grammar:

тре́ба (+ dative + infinitive) — the everyday, neutral "need to / have to." Impersonal: the person is dative, there is no subject. The most common of the three in speech.
му́сити (му́шу, му́сиш...) — a real verb meaning "must / be compelled," stronger, often with a flavour of outside pressure or inevitability. The person is the nominative subject.
пови́нен / пови́нна / пови́нні — not a verb but an agreeing predicate adjective meaning "ought to / am obliged to." It changes for gender and number (я пови́нен, вона́ пови́нна, ми пови́нні). The person is the nominative subject.

Мені́ тре́ба заско́чити в апте́ку по доро́зі додо́му.

I need to pop into the pharmacy on the way home. (тре́ба — neutral need; experiencer мені́ in the dative.)

Я му́шу йти, хоч і не хо́чу — на ме́не чека́ють.

I must go, even though I don't want to — they're waiting for me. (му́шу — compulsion; nominative subject я.)

Ти пови́нен поверну́ти кни́жку до п’я́тниці.

You have to return the book by Friday. (пови́нен — agreeing adjective, masculine; would be пови́нна for a woman.)

Вони́ пови́нні бу́ли попереди́ти нас зазда́легідь.

They should have warned us in advance. (пови́нні — plural agreement; with бу́ли for the past.)

The lighter "should / ought" is слід (impersonal, dative): Вам слід відпочи́ти "You should rest." All three degrees of "must," plus слід, are compared on тре́ба, му́сити, пови́нен.

Permission: мо́жна / не мо́жна

To ask or grant permission — "may I / one may / you can't" — Ukrainian uses the impersonal predicative мо́жна (and its negative не мо́жна) plus an infinitive. Note that this is not могти́: мо́жна is about whether something is allowed, while могти́ is about whether you are able.

Мо́жна вві́йти?

May I come in? (мо́жна — impersonal request for permission; no subject.)

Тут не мо́жна фотографува́ти — це режи́мний об’є́кт.

You can't take photos here — it's a restricted site. (не мо́жна — prohibition; English needs a fake 'you'.)

Мамо, мо́жна мені́ ще моро́зива?

Mum, can I have some more ice cream? (мо́жна + dative мені́ — asking permission for oneself.)

Desire: хоті́ти vs хоті́тися

"Want" is normally the plain verb хоті́ти (хо́чу, хо́чеш, хо́че...) with a nominative subject. But Ukrainian also has an impersonal counterpart, хоті́тися (хо́четься), for an involuntary urge or inclination — "I feel like," "I have a craving to." It takes a dative experiencer.

Я хо́чу ка́ви, ході́мо в кав’я́рню.

I want a coffee, let's go to a café. (хо́чу — deliberate want, nominative subject.)

Мені́ чому́сь хо́четься сього́дні щось соло́деньке.

For some reason I feel like something sweet today. (хо́четься — an involuntary urge; dative мені́, no subject.)

Я хо́чу, щоб ти лиши́вся.

I want you to stay. (хоті́ти + щоб + subjunctive when wanting someone else's action — note it's not an infinitive across subjects.)

A softer, more formal "wish/desire" is бажа́ти (бажа́ю); the want-verbs are compared on хоті́ти / бажа́ти.

The thread running through it all: the infinitive and the dative

Two patterns unify the whole toolkit:

Almost every modal is followed by an infinitive — могти́ прийти́, тре́ба йти, му́сиш зроби́ти, мо́жна вві́йти, хо́чу спа́ти. Get comfortable putting a bare infinitive after the modal word.
The impersonal modals (тре́ба, слід, мо́жна, хо́четься) put the person in the dative (мені́, тобі́, йому́, нам, вам), while the personal ones (могти́, вмі́ти, му́сити, пови́нен, хоті́ти) keep the person as a nominative subject. Knowing which group a modal belongs to tells you the case of the person.

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Quick test: if the modal is a real conjugating verb (могти́, вмі́ти, му́сити, хоті́ти) or the agreeing пови́нен, the person is nominative (Я мо́жу, Я му́шу, Я пови́нен). If it's a frozen predicative (тре́ба, слід, мо́жна, хо́четься), the person is dative (Мені́ тре́ба, Вам слід, Мені́ хо́четься). The case of the pronoun is your reminder of which kind of modal you're using.

Source-language comparison

For an English speaker, the core adjustment is that one English modal often equals two or three Ukrainian words, chosen by meaning. "Can" = могти́ (able/allowed by circumstance) vs вмі́ти (skilled). "Must" = тре́ба (neutral need) vs му́сити (compelled) vs пови́нен (ought, and it agrees like an adjective). On top of that, the impersonal modals demand a dative person where English has a subject: "I need to go" → Мені́ тре́ба йти, "you should rest" → Вам слід відпочи́ти. Train yourself to ask, for every modal sentence, (a) which Ukrainian tool the meaning calls for and (b) whether the person is nominative or dative.

For a Russian speaker, the system rhymes (мочь/уметь, надо/должен, можно/нельзя, хотеть/хочется), so the structure transfers — but the lexical choices differ: Ukrainian uses тре́ба (not надо), му́сити as a live "must" verb (much commoner than Russian мусить), пови́нен as the agreeing "ought," and слід / ва́рто. Spell and stress the Ukrainian forms (могти́ → можу́, мо́жеш with г→ж; хоті́ти → хо́чу, хо́чеш), and remember the standard reflexive хо́четься.

Common Mistakes

❌ Я мо́жу пла́вати з п’яти́ ро́ків. (могти́ for a learned skill)

Wrong sense — a learned skill is вмі́ти: Я вмі́ю пла́вати з п’яти́ ро́ків.

✅ Я вмі́ю пла́вати з п’яти́ ро́ків.

I've been able to swim since I was five — вмі́ти for a skill.

❌ Я тре́ба йти. (nominative subject with тре́ба)

Incorrect — тре́ба is impersonal; the person is dative: Мені́ тре́ба йти.

✅ Мені́ тре́ба йти.

I have to go — dative мені́ + тре́ба.

❌ Вона́ пови́нен зателефонува́ти. (no gender agreement on пови́нен)

Incorrect — пови́нен agrees like an adjective: Вона́ пови́нна зателефонува́ти.

✅ Вона́ пови́нна зателефонува́ти.

She has to call — feminine пови́нна.

❌ Я мо́жу вві́йти? (могти́ for asking permission)

For permission use the impersonal мо́жна: Мо́жна вві́йти? (могти́ asks about ability, not permission).

✅ Мо́жна вві́йти?

May I come in? — мо́жна for permission.

❌ Я хо́чу спа́ти, але́ мені́ хо́чу щось з’ї́сти. (mixing personal and impersonal want)

Pick one frame — personal Я хо́чу... (nominative) or impersonal Мені́ хо́четься... (dative): Я хо́чу спа́ти, але́ мені́ хо́четься щось з’ї́сти.

✅ Я хо́чу спа́ти, але́ мені́ хо́четься щось з’ї́сти.

I want to sleep, but I feel like eating something — хо́чу (nom.) vs хо́четься (dat.).

Key Takeaways

Ukrainian has no one-word modal auxiliaries; modality is spread across verbs and predicatives, mostly infinitive
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"Can" splits: могти́ (circumstance/ability — можу́, мо́жеш) vs вмі́ти (learned skill — вмі́ю пла́вати).
"Must" splits: тре́ба (neutral, dative, impersonal) vs му́сити (compelled, nominative verb) vs пови́нен (agreeing adjective — я пови́нен, вона́ пови́нна); слід = softer "should."
Permission is мо́жна / не мо́жна (impersonal), distinct from могти́.
"Want": хоті́ти (хо́чу, nominative) vs the impersonal хоті́тися (Мені́ хо́четься, dative urge).
Impersonal modals take a DATIVE person (Мені́ тре́ба, Вам слід, Мені́ хо́четься); personal ones keep a nominative subject (Я мо́жу, Я му́шу, Я пови́нен).

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