Tutorial · beginner
How to Say “I Don’t Know” in French
Learn Je ne sais pas and other natural ways to say “I don’t know” in French — with tables, tips, and practice.
The simple answer is: Je ne sais pas.
Let’s break it down word by word.
“Je” is the subject pronoun, meaning “I” in English.
“Ne” and “Pas” are usually used together to form negation in a sentence. It’s very common in French.
And “sais” is the verb meaning “Know”.
By following the pattern we learn in conjugation tutorials:
Subject + ne + verb + pas
We make the sentence meaning “I don’t know” in French.
Words and phrases in this tutorial:
Conjugation table
Below is the conjugation table of the verb savoir (Know). I hope to help you create different variations of “Don’t know” sentences in French.
Pronoun | Verb (Savior) | Meaning |
Je | sais | I know |
Tu | sais | You know |
il/elle | sait | he/she knows |
Nous | savons | We know |
ils/elles | savent | They know |
Vous | savez | You know |
Alright, now if I ask you how to say “They don’t know” in French, what would you say? Well, I guess you should be able to say:
Ils ne savent pas.
How about “She doesn't know French”? The answer is simple:
Elle ne sait pas le francais.
Other casual and polite ways to express “Dunno”
There are few more ways to say “don’t know”, one casual way is “Aucune idée”. It simply means “No idea”. Or you can say “Je sais pas” which is likely similar to “I dunno” in English.
Also, you can express “I have no idea” by the following sentence:
Je n'en sais rien.
In case you want to express in emphatic way, you can say
Je ne sais vraiment pas!
It literally means “I really don’t know!”
Useful variations
Once you know Je ne sais pas, these close cousins help you sound more natural.
| French | English | When to use |
|---|---|---|
| Je ne sais pas. | I don’t know. | default / safest |
| Je n’en sais rien. | I don’t know anything about it. | stronger “no idea” |
| Je ne sais pas du tout. | I don’t know at all. | extra emphasis |
| Aucune idée. | No idea. | short & casual |
| Je n’ai aucune idée. | I have no idea. | clear and natural |
| Je ne sais pas encore. | I don’t know yet. | when you may learn later |
Savoir vs comprendre
Don’t mix up “I don’t know” and “I don’t understand.” They are different verbs.
| You mean… | Say… | Not… |
|---|---|---|
| I don’t know the answer | Je ne sais pas. | Je ne comprends pas. |
| I don’t understand | Je ne comprends pas. | Je ne sais pas. |
| I don’t know that person | Je ne connais pas… | Je ne sais pas… |
Make it polite
You can soften “I don’t know” with a short apology — useful with strangers, teachers, or coworkers.
| Phrase | English |
|---|---|
| Désolé, je ne sais pas. | Sorry, I don’t know. |
| Pardon, je ne sais pas. | Excuse me, I don’t know. |
| Je ne sais pas, désolé(e). | I don’t know, sorry. |
| Hmm… je ne sais pas. | Hmm… I don’t know. |
Exercise 1 — Complete the Phrase
Type the missing word to finish each “I don’t know” sentence.
Fill in the blanks
Type the missing French word: sais, pas, rien, idée, encore, or comprends.
- 1.Je nepas.
- 2.Je ne sais.
- 3.Je n’en sais.
- 4.Aucune.
- 5.Je ne sais pas.
- 6.Je nepas. (I don’t understand)
Exercise 2 — Choose the Best Reply
Pick the best French answer for each situation.
Choose the correct form
Tap the correct option for each question.
1. How do you say “I don’t know”?
2. Someone asks a fact you don’t know. Best reply:
3. A short casual “No idea”:
4. “I don’t know at all.”
5. Polite version:
What to learn next?
Well, next you can start practice savoir and negation with ne … pas. Then ready to learn a warmer classic: Je t’aime.
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