Ways to say it
| French | IPA | Note |
|---|---|---|
| je ne sais pas | /ʒə n(ə) sɛ pa/ /ʒə n(ə) sɛ pɑ/ |
|
| je sais pas | informal |
To emphasize that you have no idea at all, you can use Je n'ai aucune idée, or to express uncertainty, you might say Je ne suis pas sûr(e).
Which one should you use?
'Je ne sais pas' is the grammatically complete form used in writing or formal speech, whereas je sais pas is the standard for everyday conversation.
Is there a formal and an informal way to say it?
Je ne sais pas is a polite way to say I don't know. In casual spoken French, the negation particle 'ne' is almost always dropped, resulting in the informal je sais pas. Other informal options include J'en sais rien. or J'ai pas la moindre idée. to say you haven't the slightest idea.
Is it said differently in some regions?
Chais pas. is a very informal contraction of je ne sais pas used in parts of France.
How do you pronounce it?
/ʒə n(ə) sɛ pa/
When do people say it?
A casual response meaning 'I have no idea, dude/girl' can be expressed as Aucune idée, mec/nana.
Did you know?
- The word pas in je ne sais pas originally meant 'a step' in Latin. Over time, the phrase evolved from 'I do not take a step' to a grammatical way to express a simple negation.
- French speakers often accompany je ne sais pas with a quick shrug of the shoulders and a slight lift of the chin.
- The phrase je ne sais pas is so ubiquitous that it is often used as a filler in speech while a person is thinking, much like the English 'um' or 'uh'.
Examples in context
- Je ne sais pas !I don't know!This sentence is useful for expressing 'I don't know!' using je ne sais pas.Tatoeba #6965791 by Yemana, translation #5128012 by Barra
- Je ne sais pas où.I don't know where.This sentence shows how to use je ne sais pas to say 'I don't know where.'Tatoeba #3627912 by fleur74, translation #2271869 by CK
- Je ne sais pas trop.I don't know exactly.This sentence demonstrates using je ne sais pas to say 'I don't know exactly.'Tatoeba #389075 by sysko, translation #2266936 by _undertoad
- 962 more sentences on Tatoeba
Example conversation
Manon and Hugo are looking for a lost key.
- ManonHugo, est-ce que tu as la clé ?Hugo, do you have the key?
- HugoNon, je ne sais pas où elle est.No, I don't know where it is.
- ManonTu l'as vue sur la table ?Did you see it on the table?
- HugoJe ne sais pas, je n'ai pas regardé.I don't know, I didn't look.
Sources
- Wiktionary, “I don't know” translations and entries je ne sais pas, CC BY-SA 4.0, dump of 2026-09-26.
- Word origins: Wiktionary entries je, ne, pas, CC BY-SA 4.0.
- Example sentences: Tatoeba CC BY 2.0 FR.
