How do you say at the house of in French?

There are a few ways to say "at the house of" in French, depending on the context:

Formal:

* Chez: This is the most common and versatile way to say "at the house of." It is used for both singular and plural subjects.

* Example: "Je suis chez Marie." (I am at Marie's house.)

* Example: "Ils sont chez les Dubois." (They are at the Dubois' house.)

Informal:

* À la maison de: This is more literal and less common than "chez," but it can be used for emphasis or when you want to be more specific.

* Example: "J'ai passé la soirée à la maison de Jean." (I spent the evening at Jean's house.)

Other variations:

* Au domicile de: This is a more formal way to say "at the residence of."

* Dans la maison de: This is even more literal and emphasizes the actual house.

The best option will depend on the specific situation and the level of formality you need.