This document provides information about verb tenses and their functions in English grammar. It discusses the three main tenses - present, past and future - and explains how they indicate the time of an action. It also describes the functions of tenses beyond time, such as habitual action (present tense), progressive action (present continuous), and preceding action (present perfect). The document provides examples and explanations of each tense and discusses additional uses. It notes some verbs that are non-progressive and cannot be used in the continuous form. Overall, the document serves as a reference for understanding the key concepts of verb tenses and their uses in the English language.