The document discusses the present simple tense in English. It describes two main uses: (1) for repeated or habitual actions, such as habits and schedules (e.g. "I play tennis"), and (2) for facts and generalizations that are typically true (e.g. "Birds like milk"). It provides examples for each use and notes that the third person singular form takes -s (e.g. "he plays"). The document also discusses question and negative forms using "do" or "does," and exceptions for verbs ending in y and vowels.