1. it's not necessary
2. don't have to
you don't have to do it if you don't want to
I don't have to where uniform (nie muszę)
We don't have to tidy.
You don't have to wear a suit to work, but you can if you want to.
I don't have to buy any more seeds.
I don't have to bring a dictionary
You don't have to apologize, Ben.
It's June. We don't have to go to school.
We don't have to go to work on Sunday./ She doesn't have to cook every day.
Student's don't have to ask to use the computer.
I regret I don't have to work mannually.
3. that is not necessary
4. this isn't necessary
5. it's not a must
6. is not necessary
7. it's not essential