The Office québécois de la langue française keeps a dedicated entry on the difference between savoir and connaître, and it sums the whole problem up in one line: you connaître a person or a thing, you savoir a thing. English speakers have a single verb, "to know," for both jobs, so the choice feels arbitrary at first. It is not. The two verbs split the territory along a line that is easy to see once someone points at it.
The good news is that grammar does most of the work. Look at what comes after the verb, and in most sentences the choice is already made.
What is the basic difference between savoir and connaître?
Savoir means knowing a fact or knowing how to do something, while connaître means being familiar with someone or something. The OQLF describes connaître as recognising that something exists and identifying it, and savoir as a deeper knowledge that comes from learning.
A simple way to feel the difference in English:
- savoir is "to know that", "to know how", "to know where, when, why"
- connaître is "to be acquainted with", "to be familiar with", "to have come across"
The roots help too: savoir comes from Latin sapere (behind "sapient"), connaître from cognoscere (behind "cognition" and "recognise").
When do you use savoir?
Use savoir before an infinitive, before a clause introduced by que, si, où, quand, comment or pourquoi, and for information you hold in your head. If a verb or a whole clause follows, savoir is almost always the answer.
With an infinitive, savoir means "to know how to" or simply "can", for a learned skill:
- Je sais nager. (I can swim.)
- Elle sait parler trois langues. (She can speak three languages.)
- Tu sais conduire une voiture manuelle ? (Can you drive a manual car?)
With a clause:
- Je sais qu'il travaille à Lyon. (I know that he works in Lyon.)
- Tu sais où est la gare ? (Do you know where the station is?)
- Je ne sais pas si elle vient. (I don't know if she's coming.)
- On ne sait jamais. (You never know.)
And for facts or things learned by heart:
- Il sait son texte par cœur. (He knows his lines by heart.)
- Vous savez la date de la réunion ? (Do you know the date of the meeting?)
Note the English trap here: "I can swim" is je sais nager, not je peux nager. Pouvoir is about being able or allowed right now, savoir is about having learned the skill.
When do you use connaître?
Use connaître for people, places, works, and anything you know through contact or experience, and always follow it directly with a noun. Connaître never takes an infinitive and never takes a que clause.
- Je connais bien Marseille. (I know Marseille well.)
- Tu connais mon collègue Thomas ? (Do you know my colleague Thomas?)
- Vous connaissez ce restaurant ? (Do you know this restaurant?)
- Je connais ce livre, mais je ne l'ai pas lu. (I know of this book, but I haven't read it.)
- Elle connaît le droit du travail. (She knows employment law.)
Connaître also stretches to experiences, which surprises many learners: il a connu la guerre (he lived through the war), ce film a connu un grand succès (this film was a big success). The idea is always contact with something, not information about it.
Savoir and connaître side by side
| savoir | connaître | |
|---|---|---|
| Followed by | an infinitive, or que / si / où / comment... | a noun, directly |
| Covers | facts, information, skills | people, places, works, fields, experiences |
| Typical example | Je sais qu'elle est là. | Je connais sa sœur. |
| Skill or familiarity | Je sais cuisiner. (I can cook.) | Je connais la cuisine thaïe. (I'm familiar with Thai food.) |
| Common mistake |
There is a small grey zone. With nouns that name a piece of information, such as la réponse, la vérité, son adresse or le chemin, both verbs are accepted, and the OQLF notes that in some contexts either one works. Je connais la réponse and je sais la réponse are both correct French. When in doubt with a noun, connaître is the safer choice.
How do savoir and connaître change in the past tense?
In the passé composé, both verbs shift meaning: j'ai su usually means "I found out", and j'ai connu usually means "I met" or "I went through". For the plain state of knowing in the past, use the imparfait.
- Je savais qu'il était malade. (I knew he was ill.) An ongoing state.
- J'ai su qu'il était malade la semaine dernière. (I found out he was ill last week.) A moment.
- Je connaissais bien Lyon à l'époque. (I knew Lyon well back then.)
- J'ai connu ma femme à Bordeaux. (I met my wife in Bordeaux.)
This is the same logic as the imparfait and passé composé in general: the imparfait describes a background state, the passé composé marks the moment something changed.
Why do learners keep mixing them up in conversation?
Because the rule is simple on paper and the choice has to be made in half a second while speaking. The two errors that survive longest are je connais before an infinitive and je sais before a person or a city, and both come straight from translating "I know" word for word. The cure is repetition in real exchanges until tu connais...? and tu sais si...? come out without a pause. Yann Darmon, a certified French teacher, works on exactly this kind of reflex in his lessons, and a free trial lesson at frenchwithyann.com is an easy way to test whether savoir and connaître have really settled.
Common questions
Can you ever use savoir with a person?
Not in everyday French. You connaître a person: "je connais ton frère." Savoir only comes near a person through a clause about them, such as "je sais qui est ton frère" (I know who your brother is).
Is it je sais la réponse or je connais la réponse?
Both are correct. With a handful of nouns that name information, such as la réponse, la vérité or la date, French accepts either verb. Savoir leans slightly towards information you have learned and can recall, connaître towards simply being aware of it.
What does j'ai su mean in the past tense?
In the passé composé, savoir usually means "found out" or "learned": "j'ai su la nouvelle hier" (I found out the news yesterday). For the ongoing state of knowing something in the past, French uses the imparfait: "je savais."