How you say q in french?

You don't say "q" in French. The letter "q" is always followed by a "u" and pronounced as a "k" sound.

Here are some examples:

* Qu'est-ce que...? (What is...?) - pronounced "kehss-kuh"

* Quelle heure est-il? (What time is it?) - pronounced "kel eur eh-teel"

* Quatre (Four) - pronounced "katr"

So, you would never say "q" on its own in French.