The document summarizes the uses of the present simple tense in English. It is used to express repeated actions, habits, schedules, and general facts or truths. Examples are provided to illustrate using the present simple for habitual actions like "I play tennis" as well as general facts like "Windows are made of glass." Grammatical rules for forming the present simple are also outlined, including using "s" or "es" for third person singular verbs and question and negative forms.