Resposta :
Resposta:
1. She is ill, so she _____must_______ see the doctor.
2. It is raining. You _____must_______ take your umbrella.
3. You _____mustn't_______ throw litter on the stairs.
4. This is a secret. You _____mustn't_______ tell anybody.
5. You _____mustn't_______ make noise in the library.
6. We ____must________ hurry or we will miss the bus.
7. You _____must_______ eat fruit and vegetables.
8. The baby is sleeping. You ______must______ shout.
.9. You _____must_______ be friendly to everybody.
Explicação:
•MUST: é usado para expressar obrigação e dedução.
•MUSTN'T: é usado para expressar proibição. Mustn't é a forma contraída de Must not.
Bons estudos :)