1.You have to understand!There is no way I can accept this
2.If you want to go university , you have to study hard.
3.She doesn’t,t have to buy a computer. She can use my laptop
4.Students at most schools in the UK don’t have to wear to uniform
5.I understand what you said.You don’t tell me again
6.James wants to be healthy.He has to be careful
7.You don’t have to be help me with my work.I can do it on my own