Complete the dialogue with must/mustn't, should/shouldn't. tom: mum, i don't want to go to school. mother: but you . tom: the pupils don't love me. mother: well, you shout at them. you be polite and friendly. tom: they use their mobiles but they do. they be late for school but they are. mother: you be so angry. try speaking to them. tom: that won't help. i think i'm ill. i have a running nose mother: oh, no, come on, tom. shame on you! you are ok. you go to school. you're a teacher.