When? We use
have to say that something is necessary or very important to do something
How? I/ you/ we / they = have to have to + base form verb
he /she/ it = has to + base form verb
---> Example: She has to hurry!
Negative form: don't / doesn't have to
--> Example: She doesn't have to hurry
Remember: form of do/ does/ dit --> infinitive of the verb! (NOT SHE DOESN'T HAS TO!)