Children don't have to go to school tomorrow

Children mustn't play with fire

Waiters don't have to know all menu

Waiters mustn't bu rude with customer

Nurses don't have to know English

Nurses mustn't do operation without doctor

1.Children don*t have to  attend school on Saturday

2.Children mustn*t  go on ice  across the river in early spring

3.Waiters don*t have to discuss these problems with guests.

4.Waiters mustn*t speak to the clients in such an impolite manner

5.Nurses don*t have to   teach children to read and  count

 6.Nurses mustn*t  ignore children