The document defines the simple present tense and lists its 16 uses. It explains that the simple present tense is used to describe habitual or repeated actions, general truths, and schedules or timetables. It provides examples for each of the 16 uses, which include habitual actions, definitions, facts, permanent situations, present actions with stative verbs, headlines, demonstrations, exclamations, directions, vivid narration, simultaneous actions, conditional sentences, commands, and future reference. Students are instructed to practice the simple present tense exercises in their textbook.