The key to exercise solutions in chapter 7b - Grammar for the textbook Spark 4 - Student's Book with authors Virginia Evans, Jenny Dooley from Express Publishing
Question
Rewrite the sentences using modals.
No one is allowed to enter the area.
I advised John to tidy his room.
It is quite possible that Mr Jones will like your idea.
You have permission to take the day off.
It is required that Brian finishes the report by Friday.