How do you say there is not in French?

"There is not" in French can be expressed in a few ways depending on the context:

Formal:

* Il n'y a pas: This is the most common and formal way to say "there is not".

* Il n'y a point de: This is similar to "il n'y a pas" but emphasizes the absence of something.

Informal:

* Y a pas: This is a very informal contraction of "il n'y a pas" and is commonly used in spoken French.

* Pas de: This is a more literal translation of "there is not" and is often used in written French.

Examples:

* Formal: Il n'y a pas de lait dans le réfrigérateur. (There is no milk in the refrigerator.)

* Informal: Y a pas de problème! (No problem!)

* Formal: Il n'y a point de fumée sans feu. (There is no smoke without fire.)

* Informal: Pas de panique! (Don't panic!)

Remember to use the appropriate form depending on the formality of the situation.