Modals of Obligation/Prohibition

I can't watch TV until I finish my homework.

I'm sorry John, I got to go now, I forgot I have a visit this afternoon

Hey, don't worry, you don't have to do it if you don't want

She got to work harder if she wants that raise.

Sorry Kevin, I can't stay out too late, I need to go back home.

Where's Mary? She's in the library, she said she had to study for a real important exam

I have to go to school for my supplies

Hey, the good thing is that you don't have to go to work tomorrow