The document discusses the three simple tenses in English: simple present, simple past, and simple future. [1] It explains that tense indicates when an action occurred. [2] The simple present is used for habitual or repeated actions in the present, the simple past is used for completed actions in the past, and the simple future is used for actions that will occur in the future. [3] Examples are provided to illustrate the conjugation and usage of each tense.