Ответы
Ответ:
1. "You musn't use mobile phones in exams" is correct
grammatically but it is not logical. It should be "You
mustn't use mobile phones in exams" or "You are not
allowed to use mobile phones in exams."
2. "You don't have to copy in exams" is correct
grammatically and logically.
3. "You shouldn't go out in the rain without an umbrella"
is correct both grammatically and logically.
4. "You must wear sunglasses when it's sunny" is correct
both grammatically and logically.
5. "You have to have a passport to visit the US" is correct
both grammatically and logically.
6. "You have to shout in hospitals" is not correct logically.
It should be "You mustn't shout in hospitals" or "You
are not allowed to shout in hospitals."
7. "Our teacher mustn't wear a uniform" is correct both
grammatically and logically.