This document discusses the four present tenses in English: present simple, present continuous, present perfect simple, and present perfect continuous. It provides examples and explanations of when to use each tense, such as using the present simple to talk about habits, permanent situations, or future events on a calendar. The present continuous is used for activities happening now or temporary situations. The present perfect simple is used for unfinished activities continuing up to the present or recently finished activities. The present perfect continuous is used for longer unfinished or recently finished activities or repeated actions continuing up to the present.