English has a simple two-word yes/no system: yes and no. French has three: oui, non, and si. The third word — si — is the contradictory yes, used specifically to push back against a negative question or statement. Tu n'aimes pas le café ? — Si ! means "Don't you like coffee? — Yes I do!" There is no clean English equivalent; yes in that English exchange does the same work, but in French it would be wrong: oui would mean you agree the negation is correct (i.e., that you don't like coffee).
Beyond the three core words, French has a rich family of adverbs that calibrate certainty along the affirmation–negation gradient: bien sûr (of course), certainement (certainly), absolument (absolutely), peut-être (maybe), probablement (probably), pas du tout (not at all). Learning this set early is one of the highest-yield investments in conversational fluency, because every conversation hinges on answering questions naturally.
The three core words: oui, non, si
| Word | Use | Example exchange |
|---|---|---|
| oui | yes (to a positive question) | Tu viens ? — Oui. |
| non | no (to anything) | Tu viens ? — Non. / Tu ne viens pas ? — Non. |
| si | yes (contradicting a negative) | Tu ne viens pas ? — Si, je viens. |
Oui — yes to a positive question
Oui is the default yes. Use it to confirm anything stated in the positive.
Tu veux du café ? — Oui, merci.
Do you want some coffee? — Yes, thanks.
Vous êtes français ? — Oui, je viens de Lyon.
Are you French? — Yes, I'm from Lyon.
Tu as fini tes devoirs ? — Oui, je viens de terminer.
Have you finished your homework? — Yes, I just finished.
In casual speech, French speakers often shorten or stretch oui into ouais — equivalent to English yeah. It is fine in conversation but should not appear in writing or formal speech.
T'es libre ce soir ? — Ouais, pourquoi ?
You free tonight? — Yeah, why? (informal)
Non — no, the universal denial
Non is the universal negative. It works against both positive and negative questions, because in both cases it denies the proposition's affirmative form.
Tu viens ? — Non, je suis fatigué.
Are you coming? — No, I'm tired.
Tu ne viens pas ? — Non, je reste à la maison.
You're not coming? — No (that's right — I'm staying home).
Notice the second exchange. To an English speaker, the answer Non to Tu ne viens pas ? feels backwards — English would say No meaning "no, I'm not coming," which agrees with the negative question. French does exactly the same: Non here means "you are correct that I am not coming." This works because non denies the underlying proposition I am coming, regardless of whether the question phrased it positively or negatively.
Si — yes, contradicting a negative
This is where French differs from English. When someone asks a negative question or makes a negative statement, and you want to push back and assert the positive, you use si, not oui.
Tu n'aimes pas le café ? — Si, j'adore le café !
You don't like coffee? — Yes I do, I love coffee!
Vous n'êtes jamais allé à Paris ? — Si, plusieurs fois.
You've never been to Paris? — Yes I have, several times.
Tu n'as pas reçu mon mail ? — Si, je viens de le lire.
You didn't get my email? — Yes I did, I just read it.
Ce n'est pas grave. — Si, c'est grave !
It's not a big deal. — Yes it is, it is a big deal!
If you use oui here, you say the opposite of what you mean. Tu n'aimes pas le café ? — Oui would be interpreted as "Yes (you're right, I don't like coffee)" — confirming the negative. To deny the negative and assert the positive, you must use si.
Why this exists: French and a handful of other languages
The contradictory-yes word is rare in the world's languages but not unique to French. German has doch, Dutch has jawel, Swedish has jo. English used to have one too — yea/nay vs yes/no in Middle English distinguished answers to positive and negative questions, but the system collapsed by Shakespeare's time. French preserved its system, and the result is a small but high-traffic distinction every learner has to internalize.
The logic is precise: French (and German, and Dutch) lets you assert a positive proposition specifically in opposition to a stated negative. English compresses both yes I agree and yes I disagree-with-the-negative into a single yes, leaning on intonation and follow-up to disambiguate. French does it lexically.
The mirror: contradicting a positive
There is no dedicated word for no, you're wrong to push back against a positive. French uses non for that too, often reinforced (non, pas du tout, non, absolument pas) to make the contradiction unmistakable.
C'est facile, non ? — Non, c'est très difficile au contraire.
That's easy, right? — No, on the contrary, it's very hard.
Tu vas accepter l'offre. — Non, absolument pas.
You're going to accept the offer. — No, absolutely not.
Reinforced affirmation: bien sûr, certainement, absolument
The bare oui and si are often felt to be too clipped. French speakers reach constantly for reinforced versions that signal degree of certainty or enthusiasm.
| Adverb | Meaning | Register |
|---|---|---|
| bien sûr | of course | neutral, very common |
| certainement | certainly, surely | neutral, slightly formal |
| absolument | absolutely | neutral, emphatic |
| évidemment | obviously, of course | neutral, slightly assertive |
| tout à fait | exactly, that's right | neutral, very common |
| volontiers | gladly, with pleasure | polite, slightly formal |
| d'accord | OK, agreed | neutral, conversational |
Tu peux m'aider une seconde ? — Bien sûr.
Can you help me for a sec? — Of course.
Vous prenez du sucre dans votre café ? — Non, jamais. — Très bien.
Do you take sugar in your coffee? — No, never. — All right.
Je peux compter sur toi pour demain ? — Absolument, ne t'inquiète pas.
Can I count on you for tomorrow? — Absolutely, don't worry.
C'est bien aujourd'hui qu'on se retrouve à 19h ? — Tout à fait.
It is today that we're meeting at 7 PM, right? — That's right.
Tu veux qu'on commande ? — Volontiers, je meurs de faim.
Want to order? — Gladly, I'm starving.
On y va ? — D'accord, j'arrive.
Shall we go? — OK, I'm coming.
Some of these — bien sûr, absolument, tout à fait — function as stand-alone replies and as full reinforcers placed before or after the verb:
Tu es absolument certain ? — Absolument.
Are you absolutely certain? — Absolutely.
Elle a tout à fait raison sur ce point.
She is entirely right on this point.
Il est bien sûr trop tard pour annuler.
It is of course too late to cancel.
Si + reinforcer: contradicting a negative emphatically
When you really want to push back against a negative, French stacks reinforcers after si:
Tu n'as pas vu le film ? — Si, bien sûr ! On l'a vu ensemble, tu te souviens pas ?
You haven't seen the film? — Yes, of course! We saw it together, don't you remember?
Vous n'aimez pas le vin ? — Si, absolument, j'en bois souvent.
You don't like wine? — Yes, absolutely, I drink it often.
Tu ne viens pas demain ? — Si si si, je viens.
You're not coming tomorrow? — Yes yes yes, I'm coming. (repeated for emphasis)
The triple si si si in the last example is a stock conversational gesture for "yes, definitely, don't doubt it." Native speakers do this frequently.
Reinforced negation: pas du tout, absolument pas
Just as affirmation has reinforcers, negation has its own family. The most useful:
| Expression | Meaning | Register |
|---|---|---|
| pas du tout | not at all | neutral, very common |
| absolument pas | absolutely not | neutral, emphatic |
| certainement pas | certainly not | neutral, emphatic |
| en aucun cas | under no circumstances | formal |
| jamais (de la vie) | never (in my life) | neutral, emphatic |
| (non) pas vraiment | not really | neutral, soft |
Ça te dérange si je fume ? — Pas du tout, vas-y.
Does it bother you if I smoke? — Not at all, go ahead.
Tu as accepté l'offre ? — Absolument pas, c'était une arnaque.
Did you accept the offer? — Absolutely not, it was a scam.
Tu accepterais de travailler là-bas ? — Jamais de la vie.
Would you agree to work there? — Never in my life.
Tu as aimé le film ? — Bof, pas vraiment.
Did you like the film? — Meh, not really.
The expression pas du tout is one of the highest-frequency answers in everyday French — equivalent to English not at all but used more often. It's also the most natural way to dismiss a polite worry: je te dérange ? — Pas du tout.
The middle: peut-être, probablement, sans doute
Between yes and no lies the gradient of uncertainty. The key adverbs:
| Adverb | Meaning | Strength |
|---|---|---|
| peut-être | maybe, perhaps | weakest — genuine uncertainty |
| sans doute | probably (literally: without doubt, but used for probably) | moderate to strong |
| probablement | probably | moderate |
| sûrement | surely, almost certainly | strong (but less certain than English "surely") |
| il paraît que / il paraît | apparently | hearsay |
Tu viens demain ? — Peut-être, je te dirai ce soir.
Are you coming tomorrow? — Maybe, I'll let you know tonight.
Il va pleuvoir ? — Sans doute, regarde le ciel.
Is it going to rain? — Probably, look at the sky.
C'est lui qui a fait ça ? — Probablement, mais on n'en est pas sûrs.
He's the one who did that? — Probably, but we're not sure.
Bien — many lives beyond well
The adverb bien has a stand-alone affirmative life beyond its base meaning well. In short replies and emphatic constructions, bien functions as a confirmation marker — roughly equivalent to English indeed, really, or quite.
| Expression with bien | Meaning |
|---|---|
| eh bien | well, ... (discourse marker) |
| c'est bien ça | that's right / that's it |
| bien sûr | of course |
| bien entendu | of course (slightly more formal than bien sûr) |
| je veux bien | I'd be happy to / sure |
| tu as bien fait | you did the right thing |
| c'est bien lui | it really is him |
| très bien | very well, all right |
Eh bien, on se voit demain alors.
Well, see you tomorrow then.
C'est bien toi sur cette photo ? — Oui, c'est moi, j'avais dix ans.
Is that really you in this photo? — Yes, that's me, I was ten.
Tu peux m'accompagner ? — Je veux bien, mais je n'ai pas longtemps.
Can you come with me? — Sure, I'd be happy to, but I don't have long.
Bien entendu, vous serez remboursé intégralement.
Of course, you'll be fully reimbursed. (formal)
The construction je veux bien is especially useful as a non-committal yes: a polite, mildly enthusiastic acceptance, gentler than a flat oui but more positive than peut-être.
Answering tag questions
French speakers often add n'est-ce pas ?, non ?, or hein ? to seek confirmation — these are tag questions. The answer rules are the same as for any other yes/no question. If the tag question is phrased positively (c'est bon, non ?), answer with oui or non. If phrased negatively, French speakers sometimes prefer si, though in rapid speech non tagged onto a positive statement is essentially a checked positive — answer the proposition, not the tag.
C'est bon, non ? — Oui, c'est très bon.
It's good, right? — Yes, it's very good.
Tu n'as pas oublié les clés, hein ? — Si, je les ai.
You didn't forget the keys, right? — Yes (I have them — contradicting the implied negative).
For more on tag questions, see questions/tag-questions.
Worked examples
1. Don't you speak French? — Yes I do! → Tu ne parles pas français ? — Si !
2. Are you coming? — Of course. → Tu viens ? — Bien sûr.
3. Did you accept? — Absolutely not. → Tu as accepté ? — Absolument pas.
4. He's probably right. → Il a probablement raison. OR Sans doute qu'il a raison.
5. No, not at all, you're not bothering me. → Non, pas du tout, tu ne me déranges pas.
6. Want to come? — Sure, I'd be happy to. → Tu veux venir ? — Je veux bien.
7. You weren't there yesterday? — Yes I was, I came at 6 PM. → Tu n'étais pas là hier ? — Si, je suis venu à 18 h.
8. Maybe, we'll see. → Peut-être, on verra.
Common Mistakes
❌ Tu n'aimes pas le café ? — Oui, j'adore le café !
Incorrect — to contradict a negative question, use si, not oui. Oui here would mean 'yes, you're right that I don't like coffee'.
✅ Tu n'aimes pas le café ? — Si, j'adore le café !
You don't like coffee? — Yes I do, I love it!
❌ Sans doute il va pleuvoir, prends ton parapluie au cas où.
Misleading register — sans doute means 'probably,' not 'without doubt.' Saying this in English style overstates the certainty.
✅ Sans aucun doute il va pleuvoir, prends ton parapluie.
Without any doubt it'll rain, take your umbrella.
❌ Ça te dérange ? — Non du tout.
Incorrect — the fixed expression is pas du tout, not 'non du tout'.
✅ Ça te dérange ? — Pas du tout.
Does that bother you? — Not at all.
❌ Tu viens ? — Si, j'arrive.
Incorrect — the question is positive, so the answer is oui. Si is only for contradicting a negative.
✅ Tu viens ? — Oui, j'arrive.
Are you coming? — Yes, I'm on my way.
❌ Vous voulez du vin ? — Bien.
Awkward — bien alone is not a stand-alone yes. Use oui, très bien, or je veux bien.
✅ Vous voulez du vin ? — Je veux bien.
Would you like some wine? — Yes, gladly.
Key takeaways
- French has a three-word yes/no system: oui (yes to a positive), non (no to anything), si (yes contradicting a negative).
- Never answer a French negative question with oui when you want to push back. The right word is si.
- Use reinforcers — bien sûr, absolument, tout à fait, certainement — instead of bare oui in most spoken contexts. Bare oui feels clipped.
- For negation: pas du tout is the everyday "not at all"; absolument pas / jamais de la vie are the emphatic versions.
- Peut-être = maybe (genuine uncertainty); sans doute = probably (NOT "without doubt" — that is sans aucun doute); sûrement = almost certainly.
- Bien outside its base meaning well has a confirmation-marker life: bien sûr (of course), c'est bien lui (it really is him), je veux bien (sure, gladly).
- For longer agreement / disagreement patterns in dialogue, see sentences/agreement-and-disagreement.
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Start learning French→Related Topics
- Les Adverbes: OverviewA1 — A map of the French adverb system: the six main types (manner, time, place, quantity, affirmation/negation, frequency), the -ment formation that powers most of them, and the default position rules that English speakers regularly get wrong.
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- Accord et DésaccordB1 — How to agree, disagree, and softly push back in French — from emphatic tout à fait to the diplomatic je vois ce que tu veux dire, mais — plus the uniquely French si that contradicts a negative question.
- Les Questions: OverviewA1 — A survey of the French question system — the three ways to ask (intonation, est-ce que, inversion), the split between yes/no questions and WH-questions, and the full set of question words (qui, que, quoi, où, quand, comment, pourquoi, combien, quel, lequel). The map that orients you before drilling into individual rules.
- Les Questions NégativesA2 — How to ask negative questions in French — and the special yes/no answer system with si that English lacks entirely.
- Les Questions de Confirmation: 'n'est-ce pas'A2 — How to add a confirmation tag to a French statement — n'est-ce pas, non, hein, and the regional 'eh' — and which one belongs in which register.