Froggy Jumps Must, Mustn't, Can't QuizVersion en ligne Test your knowledge on must, mustn't, and can't in English grammar! par Maison Almagedi 1 Choose the correct form: She _____ be at work; it's already 9 AM. a mustn't b must c can't 2 Fill in the blank: He _____ be the one who broke the window. a must b can't c mustn't 3 Which option is correct? You _____ smoke in here. a mustn't b must c can't 4 Choose the correct sentence: They _____ have taken your book. a mustn't b must c can't 5 Fill in the blank: You _____ finish your homework before playing. a mustn't b can't c must 6 Fill in the blank: You _____ leave your bike unlocked. a can't b mustn't c must 7 Choose the correct form: He _____ be at home; his car is gone. a must b mustn't c can't