The key to exercise solutions in chapter 08 - Language focus 1 for the textbook Cutting Edge Upper-Intermediate - Student's Book with authors Sarah Cunningham, Peter Moor and Jonathan Bygrave from Pearson Education
Question
Match the modals you chose to the meanings below.
Answer
must (this shows that the speaker is sure something is true)
may; might; could (note that we don't use can in this way)