i have a car: i don't have a car do you have a car? no. i dont have. i have got a car: i haven't got a car. have you got a car? no. i haven't got a car. i have had a good night: i haven't had a good night. have you had a good night? no, i haven't.

I don't have/I do not have/ I have: precedes a NOUN (expresses possession) (I have a dog. I don't have a dog.) I haven't/ I have not/ I have: precedes a VERB/ PAST PARTICIPLE (I have spoken. I haven't spoken.) ***English speakers also often say "have got" or "haven't got" to express possession. Although this occurs, it is grammatically incorrect. Ex: I've/ I have got a ticket to the movie. (<<incorrect) I have a ticket to the movie.(<<<correct)

-you say I haven't when someone asks you about if you have done something so it's about verbs for example: have you traveled to Italy? you say "No,I haven't" - you say I don't have when someone asks you if you have something. for example: do you have some food? you say "No, I don't have" so "I haven't" is for "Have you.." while " I don't have" is for "do you have.."