This document is from the website ace-up.net and contains an English grammar lesson on prepositions from Raymond Murphy's book Grammar in Use. The lesson, taught by ACERS School on July 25, 2013, covers using prepositions like "by", "to", and "on" correctly with verbs and expressions involving means of transportation, passive voice, and indicating differences in scores or amounts. Examples are provided for each case to illustrate the proper uses of these prepositions.