Краткое пояснение: Необходимо правильно использовать модальные глаголы must, mustn't, can, can't, should, shouldn't, учитывая контекст каждого предложения.
- My little brother is too young, he can't swim without an adult.
- If you want to be healthy, you should sleep 8 hours every night.
- We mustn't forget to buy bread — mum asked us.
- Should I open the window? It's too hot here.
- This door is locked, so we can't go inside.
- You should be polite to other people. It's important.
Ответ: can't, should, mustn't, should, can't, should