Underline the correct answer a: good morning, madam. may/must i help you? b: you might/mustn’t be able to. i need a ball of wool that is the same color as my jumper. a: just a moment, please. i must/mustn’t look in the stock room. we might/might not have some left. i’m not sure. b: the wool must/mustn’t be exactly the same color, it must/mustn’t be different. a: could/mustn’t i ask you a question, madam? b: yes. a: what do you want the wool for? b: i could/must finish knitting this jumper. it only has one sleeve at the moment!