How do you say i have got a pen in french?

There are a few ways to say "I have got a pen" in French, depending on how formal or informal you want to be:

Formal:

* J'ai un stylo. (Most common and neutral)

Informal:

* J'ai un stylo. (Still works here)

* J'ai un crayon. (If you are talking about a pencil)

* J'ai un bic. (Slang for ballpoint pen, mostly used in France)

* J'ai un stylo à bille. (More formal way of saying ballpoint pen)

You can also use the verb "avoir" in a more informal way with the phrase "j'en ai un":

* J'en ai un. (I have one, referring to a pen)

The choice of which phrase to use depends on the context and your level of formality.