Which one should you use?
The phrase tu es fou ? uses the informal tu, making it suitable for friends or family but potentially rude to strangers. For a more intense or colloquial way to ask if someone is crazy, you can use T'es taré(e)? If you want to ask if someone has become crazy, use T'es devenu fou/folle? To ask if someone is nuts or acting crazy using slang, use t'es dingue ?
Is there a formal and an informal way to say it?
Êtes-vous fou/folle? is a formal way to ask someone if they is crazy. Es-tu fou/folle? is a slightly less formal variant used when addressing a single person informally. T'es fou/folle? and T'es dingue ? are informal, while T'es taré(e)? is colloquial.
How does it change in a sentence?
The adjective changes to the feminine form folle if you are addressing a woman, such as in tu es folle ? When addressing one woman formally, use vous êtes folle ?
Did you know?
- In certain historical contexts, the word fou traces its roots back to the Arabic word for 'elephant', via the Spanish word for a chess piece.
- In French, calling someone fou can be a compliment in certain contexts, such as describing someone with 'crazy' or incredible talent.
- While 'crazy' is a general term, using the slang term taré implies that the person's brain is 'twisted' or 'warped'.
Examples in context
- Excusez-moi, monsieur, mais êtes-vous fou ? Vous parlez tout seul.Excuse me, sir, but are you crazy? You're talking to yourself.
- T'es taré ou quoi? Tu as peur de la hauteur?Are you crazy or something? Are you afraid of heights?
- Dis-moi, tu es fou ?Tell me, are you crazy?
Example conversation
Lucas wants to climb a wall without any equipment.
- ChloéTu es fou ?Are you crazy?
- LucasNon, je suis courageux !No, I am brave!
- ChloéC'est trop dangereux pour toi, Lucas.It is too dangerous for you, Lucas.
- LucasNe t'inquiète pas pour moi.Don't worry about me.
Sources
- Word origins: Wiktionary entries fou, tu, CC BY-SA 4.0.
