Don't have to / Doesn't have to = it isn't necessary
Form AFFIRMATIVE SENTENCES SUBJECT MODAL VERB EXAMPLES affirmative sentences ( + ) NECESSITY: have to/has to means it is necessary. I you we they have to clean get pick up have eat go work I have to clean my room. You have to get a new book. We have to pick up the laundry. They have to have a notebook. he she it has to He has to eat dinner now. She has to go to work now. It has to work .
NEGATIVE SENTENCES SUBJECT MODAL VERB EXAMPLES negative sentences ( - ) LACK OF NECESSITY: don't have to/doesn't have to means it is not necessary. You have a choice. I you we they don't have to work do clean eat work go be I don't have to work on Saturday. You don't have to do that. We don't have to clean the car. They don't have to eat pizza. he she it doesn't have to He doesn't have to work tomorrow. She doesn't have to go today. It doesn't have to be that way.
have HAVE INTERROGATIVE SENTENCES MODAL SUBJECT VERB EXAMPLES WH- word (if necessary) do I you we they work do clean eat work go be When do you have to start ? Do I have to clean it? does he she it What does she have to do ? Does he have to buy them?