French modal verbs: devoir, pouvoir, vouloir

Je dois partir, mais je veux rester — tu peux m'aider ?I have to leave, but I want to stay — can you help me?

Three small, irregular verbs — devoir, pouvoir, vouloir — do a huge amount of work in French. Each one pairs with a following infinitive to add a layer of meaning on top of it: devoir says something is necessary, pouvoir says something is possible, vouloir says something is wanted. Once you know their forms, you can add "have to," "can," and "want to" to almost any verb you already know.

Quick shortcut: devoir / pouvoir / vouloir + infinitive — je dois partir, je peux partir, je veux partir.

The three verbs in the present tense

All three are irregular, and they share a family resemblance: singular forms with one stem, a nous/vous form with its own stem, and their own irregular stem plus the silent ending -ent for ils/elles.

All three follow the same pattern here: an irregular singular stem, a distinct nous/vous stem, and their own irregular plural stem plus the silent ending -ent for ils/elles (doiv-ent, peuv-ent, veul-ent). Their full conjugation — including other tenses — is covered together with French's other common irregular verbs; this article focuses on how each one is used.

All three take a bare infinitive — no preposition in between. When that infinitive itself has an object or reflexive pronoun, the pronoun goes right before the infinitive, not before devoir/pouvoir/vouloir: Je dois le faire. *Tu peux **m'*aider.

devoir + infinitive: obligation

devoir followed by an infinitive expresses that something is necessary or obligatory — "must" or "have to":

• Je dois finir ce rapport aujourd'hui. (I have to finish this report today.)
• Tu dois te reposer. (You must rest.)
• Nous devons partir tôt. (We have to leave early.)

devoir can also express a strong probability or logical deduction, not just an obligation — a different but related sense:

• Il doit être fatigué après ce voyage. (He must be tired after that trip.) — a guess, not a command.

devoir expresses a personal obligation, tied to a specific subject who conjugates it. French also has an impersonal way to state a general necessity — il faut + infinitive — which never conjugates for person at all.

A softer devoir: devrais / devrait for advice

The conditional form devrais (and devrait, devriez...) softens devoir from a flat obligation into a piece of advice — closer to "should" than "must":

• ✅ Tu devrais dormir plus. (You should sleep more.) — a friendly suggestion.
• ✅ Tu dois dormir plus. (You have to sleep more.) — a much stronger, more directive statement.

Both are correct French; they differ in force. devrais is the natural choice for gentle advice, while dois expresses stronger necessity — and can sound insistent or bossy if used for a mere suggestion.

pouvoir + infinitive: ability and permission

pouvoir followed by an infinitive covers two related ideas: being physically or mentally able to do something, and being allowed to do it.

• Je peux nager un kilomètre. (I can swim a kilometre.) — ability.
• Est-ce que je peux sortir ce soir ? (Can/May I go out tonight?) — permission.
• Tu peux m'aider, s'il te plaît ? (Can you help me, please?) — a polite request.

The context — not the verb form — tells you which sense is meant; French uses the same word for both, just like English "can."

vouloir + infinitive: desire

vouloir followed by an infinitive expresses what someone wants to do:

• Je veux apprendre le français. (I want to learn French.)
• Elle veut voyager cet été. (She wants to travel this summer.)
• Ils veulent manger maintenant. (They want to eat now.)

A politer vouloir: je voudrais

Used bluntly, je veux can sound blunt or even rude, especially with someone you don't know well or in a service setting. The conditional form je voudrais ("I would like") is the everyday, polite way to make a request:

• ✅ Je voudrais un café, s'il vous plaît. (I would like a coffee, please.) — polite, the natural choice at a café counter.
• ❌ Je veux un café. (I want a coffee.) — grammatically fine, but comes across as demanding in the same situation.

voudrais is one of the first conditional forms French learners use in practice, well before the rest of the conditional mood is formally studied.

Common mistakes

• ❌ Je dois à partir. → ✅ Je dois partir. (no preposition between devoir and the infinitive)
• ❌ Je peux à aider. → ✅ Je peux aider. (same — pouvoir takes a bare infinitive too)
• ❌ Je veux que partir. → ✅ Je veux partir. (with the same subject doing both actions, no que — que + subjunctive is only needed when the subject changes, e.g. Je veux que tu partes)
• ❌ Ils doient → ✅ Ils doivent (irregular ils/elles spelling: doiv-ent, not doi-ent)
• ❌ Je veux un café at a counter with a stranger → ✅ Je voudrais un café (the polite conditional is expected in this context)

Quick check

This quick check uses devoir, pouvoir or vouloir in the right form.

1. Nous ____ (devoir) rentrer avant minuit.
2. Est-ce que tu ____ (pouvoir) m'aider demain ?
3. Elle ____ (vouloir) visiter l'Italie un jour.
4. Ils ____ (pouvoir) venir samedi.
5. Poliment, au restaurant : Je ____ (vouloir) une table pour deux.

Key takeaways

• devoir, pouvoir, vouloir each pair with a following infinitive — no preposition — though an object or reflexive pronoun that belongs to the infinitive goes right before it, not before the modal (je dois le faire).
• devoir = obligation (je dois partir) or, in context, probability/deduction (il doit être fatigué).
• pouvoir = ability or permission (je peux nager, je peux sortir ?) — context tells them apart.
• vouloir = desire (je veux apprendre).
• The conditional forms devrais (advice, softer than dois) and voudrais (polite requests, softer than veux) are everyday alternatives to the plain present, useful for suggestions and polite requests.
• All three are irregular: singular stem, separate nous/vous stem, own irregular ils/elles stem.