The key to exercise solutions in chapter 6 - How was your flight? for the textbook Outcomes Beginner - Student's Book with authors Hugh Dellar and Andrew Walkley from National Geographic Learning
Question
Look at the photos (a-d). Say if each is a big problem or a small problem.
Answer
is not serious (but it is disappointing)
is a serious problem (you could miss a holiday or work
could be serious (you can’t sleep)
is not serious (but might be serious if you are tired every day)