Formal:
* N'ai pas: This is the most common way to say "have not" in the present tense, used with the verb "avoir" (to have). For example, "Je n'ai pas de voiture" (I don't have a car).
* N'avais pas: This is the past tense of "n'ai pas". For example, "Je n'avais pas de temps" (I didn't have time).
* N'aurai pas: This is the future tense of "n'ai pas". For example, "Je n'aurai pas de problème" (I won't have a problem).
Informal:
* Pas: This is a shortened version of "n'ai pas" and can be used in casual conversations. For example, "J'ai pas faim" (I'm not hungry).
* N'a pas: This is the third person singular of "n'ai pas". For example, "Il n'a pas de chance" (He's unlucky).
It's important to note that the conjugation of the verb "avoir" changes based on the subject and tense. Here are some examples:
* Je n'ai pas (I don't have)
* Tu n'as pas (You don't have)
* Il/Elle/On n'a pas (He/She/One doesn't have)
* Nous n'avons pas (We don't have)
* Vous n'avez pas (You don't have)
* Ils/Elles n'ont pas (They don't have)