The passage discusses the use of the prepositions "beside" and "between" when describing spatial relationships. It uses the example of a fat cat waiting beside a bag for a small mouse hiding between books. It also provides examples of how to use "beside" when something is next to another thing and "between" when something is in the middle of two other things. The passage concludes by instructing the reader to answer questions about using these prepositions on page 144 of their language book.