Ex 1 .
1. A: Shall I help you with the washing - up ?
B: No, you don't have to . I can manage by myself.
2.A: You mustn't eat or drink in the libray .
B : Ok. I'll put my food away.
3.A : Shall I Make an appointment for you at the hairdresser's ?
B: No, you don't have to . I've made one already.
4. A : You mustn't smoke on buses or trains .
B: I know . It's forbidden .
5. A: We don't have to wear a uniform at school
B: Oh . really ? We do .
6. A : You don't have to switch on your mobile phone during take-off.
B : Yes, I know .
Ex 2 . Zakreśl prawidłowe ;
Could you turn down the music , please ?
James doesn't have to do his homework tonight because it's saturday tomorrow!