How do you say i have blue curtains in french?

There are a few ways to say "I have blue curtains" in French, depending on the formality of the situation:

Formal:

* J'ai des rideaux bleus. (This is the most common and neutral way to say it.)

* Je possède des rideaux bleus. (This is a bit more formal and emphasizes ownership.)

Informal:

* J'ai des rideaux bleus. (This is still acceptable, but it can sound a bit casual.)

* Mes rideaux sont bleus. (This literally translates to "My curtains are blue," but it's a common way to say "I have blue curtains.")

You can also add a little more detail to your sentence:

* J'ai de beaux rideaux bleus. (I have beautiful blue curtains.)

* J'ai des rideaux bleus foncés. (I have dark blue curtains.)

* J'ai des rideaux bleus à fleurs. (I have blue curtains with flowers.)

Ultimately, the best way to say it will depend on the context of the conversation.