The document summarizes a lecture given in Tokyo in November 2009 by Professor Mark Petersen on writing English essays. It provides examples from essays submitted to the I-OsMOSIS English Essay and Criticism Contest 2009, with Professor Petersen explaining common mistakes made by Japanese writers. Some issues discussed include subject-verb agreement, tense usage, relative clauses, prepositions, and the distinction between limiting and non-limiting clauses. The goal is to help Japanese learners improve their English writing skills.