This document provides a detailed overview of English verb tenses and their usage. It includes a table that lists 17 different tenses and their forms, along with examples of affirmative, negative, and interrogative sentences. For each tense, it describes the time or situation in which it is used and lists common "signal words" that indicate when that tense should be used. The document concludes by noting that continuous and progressive can sometimes be used interchangeably for certain tenses and that signal words are not always listed for future tenses.