This document discusses verb tenses and how they are used to indicate when actions take place. It explains that verbs change form through modifications like suffixes or spelling to show time and that readers rely on consistent verb tense usage for understanding when events occurred. It also provides examples of how the six main verb tenses - present, past, future, present perfect, past perfect, and future perfect - are formed and used to denote actions happening now, in the past, or in the future.