Write the sentences using to have to do something. 1) you mustn't walk on the grass. 2)you mustn't speak loudly in the library. 3) you mustn't be late for the performance. 4)you mustn'n take pictures in the museum. 5)you mustn't listen to the radio in class. 6) you mustn't go to bed at midnight. !

1)You have to walk not on the grass.
2)You have to be quite in the library.
3)You have to be on time for the performance. 
4)You have to not take pictures in the museum.
5)You have to pay attention to the teacher in the class.
6)You have to go to bed before midnight.