This document discusses verb tenses and conjunctions. It covers the three types of English sentences: simple, compound, and complex. It also discusses coordinate conjunctions like "and", "but", and "or" that are used to connect independent clauses. The document provides examples of compound sentences with two independent clauses joined by a conjunction with and without commas. It distinguishes between compound sentences and compound verbs. Finally, it discusses the use of commas with conjunctions in sentences and series.