The document discusses how to use the simple present tense in English. The simple present tense expresses habits, general truths, and repeated actions that exist now or will exist in the future. It is used to describe things that are always or usually true, like "the sun is a star" or "she brushes her teeth." It can also describe actions that happen regularly or habitually, such as "they eat lunch at 2:00." The simple present tense can be made affirmative, negative, or interrogative and has short answers for yes/no questions.