How do you say my pencil is big French?

There are a few ways to say "My pencil is big" in French, depending on the context and the size of the pencil:

Formal:

* Mon crayon est gros. (This is the most literal translation, but sounds a bit unnatural.)

* Mon crayon est volumineux. (This emphasizes the volume and size of the pencil, making it sound bigger than just "gros".)

* Mon crayon est de grande taille. (This means "My pencil is of a big size.")

Informal:

* Mon crayon est grand. (This is the most natural way to say it.)

* Mon crayon est énorme. (This means "My pencil is enormous.")

* J'ai un gros crayon. (This means "I have a big pencil.")

You can also add a little bit of context to your sentence, like:

* Mon crayon est trop gros pour mon trousse. (My pencil is too big for my pencil case.)

* J'ai un gros crayon, mais il écrit bien. (I have a big pencil, but it writes well.)

The best way to say it will depend on the specific situation and the tone you want to convey.