This document contains lecture notes on sentence errors, subject-verb agreement rules, and verb tenses for academic writing. It discusses the basic rules of subject-verb agreement, such as singular subjects requiring singular verbs and plural subjects requiring plural verbs. It provides examples of these rules and exceptions. It also addresses the appropriate uses of the simple present, simple past, and present perfect tenses in academic writing. Exercises are included for students to practice identifying errors in subject-verb agreement and correcting them.