Which one should you use?
While qu'est-ce que tu fais ? literally means 'what are you doing?', it is the standard way to translate the casual English 'what are you up to?' in most contexts. For a more specific inquiry regarding the immediate present, you might use Qu'est-ce que tu fais en ce moment ? or Que faites-vous en ce moment ? to ask 'What are you doing right now?'
Is there a formal and an informal way to say it?
The level of formality depends on which form you choose. Qu'est-ce que tu fais ? is a casual option. For highly informal spoken French, you can use Tu fais quoi ?, which translates to 'What are you doing?' If you need to be formal, use Qu'est-ce que vous faites actuellement ? ('What are you currently doing?') or Que faites-vous en ce moment ? ('What are you doing right now?').
Is it said differently in some regions?
In France, the expression Qu'est-ce que tu fiches ? is an informal way to say 'What are you up to?' that often carries a connotation of surprise or suspicion.
How does it change in a sentence?
When addressing more than one person, or when addressing a single person in a formal manner, use the form qu'est-ce que vous faites ?
Did you know?
- The expression qu'est-ce que literally translates to 'what is it that', creating a complex double-question structure just to say 'what'.
- French speakers often drop the ne in negative responses to this question, such as Je fais rien, even though textbooks insist on Je ne fais rien.
- The pronoun tu is a cognate with the German 'du' and the Russian 'ты'.
Examples in context
- Hé, salut ! Qu'est-ce que tu fais en ce moment ?Hey, hi! What are you doing right now?
- Coucou ! Tu fais quoi ?Hey there! What are you doing?
Example conversation
Lucas calls Emma on her mobile phone.
- LucasSalut Emma, qu'est-ce que tu fais ?Hi Emma, what are you up to?
- EmmaJe regarde un film, et toi ?I am watching a movie, and you?
- LucasRien de spécial, je m'ennuie un peu.Nothing special, I am a bit bored.
- EmmaTu veux venir chez moi ?Do you want to come to my place?
Sources
- Word origins: Wiktionary entries que, tu, CC BY-SA 4.0.