In most cases, we use oui (yes) and non (no) in French the same way as in English.
However, if someone asks you a negative question or makes a negative statement and you want to disagree with it (i.e. answer in the positive) then use si instead of oui.
Here are some examples:
Agreeing...
Est-ce que tu parles français? Oui, je parle français.
Do you speak French? Yes, I speak French.
Disagreeing...
Tu ne t'amuses pas? - Si, je m'amuse.
Aren't you having a good time? - Yes, I am.
Il n'est pas gentil. - Si, il est gentil.
He's not nice. - Yes, he is.
Bref, ce n'est pas important... - Si, c'est important !
Anyway, it's not important... - Yes, it is!
Tu n'as pas une clope? - Si.
Don't you have a smoke? - Yes I do.
Summary:
- Use Oui to answer "yes" to positive questions/statements
- Use Si to answer "yes" to negative questions/statements
Note that non is always the same whether you are agreeing or disagreeing:
Learn more about these related French grammar topics
Examples and resources
Bref, ce n'est pas important... - Si, c'est important !
Anyway, it's not important... - Yes, it is!
Il n'est pas gentil. - Si, il est gentil.
He's not nice. - Yes, he is.
Tu ne parles pas français? - Si! Je parle français.
Don't you speak French? - Yes! I do speak French.
Est-ce que tu parles français? Non, je ne parle pas français.
Do you speak French? No, I don't speak French.
Tu n'as pas une clope? - Si.
Don't you have a smoke? - Yes I do.
Tu ne parles pas français? - Non, je ne parle pas français.
Don't you speak French? - No, I don't speak French.
Tu ne t'amuses pas? - Si, je m'amuse.
Aren't you having a good time? - Yes, I am.
Attention
Est-ce que tu parles français? Oui, je parle français.
Do you speak French? Yes, I speak French.
Don
Kwiziq community member
2 October 2017
1 reply
What about sentences that end with "non."
In this context, is a sentence that ends with "non" (like "Tu as faim, non ?") considered a positive or negative question? I am guessing it is positive, and that an affirmative answer would be made with "oui" instead of "si."
Ron
Kwiziq community member
4 October 2017
4/10/17
Je suis d'accord avec vous. Le «non» fait la phrase interrogative; pourtant, Tu as faim est affirmative.
J'espère que ma réponse vous aiderait.
Bonne chance et bonne continuation dans vos études en français, la langue de Molière et qui a été utilisé par le monde français depuis l’époque d’Hugues Capet