Formal:
* Ils habitent: This is the most common and neutral way to say "they live".
* Ils résident: This is a more formal way to say "they live", often used when talking about people living in a specific place, like a hotel or a building.
Informal:
* Ils vivent: This is a more informal way to say "they live", and it can be used when talking about people's lifestyle or where they spend their time.
Example sentences:
* Ils habitent à Paris. (They live in Paris.)
* Ils résident dans un hôtel de luxe. (They reside in a luxury hotel.)
* Ils vivent une vie simple. (They live a simple life.)
It's important to choose the appropriate translation based on the context and formality of the situation.