The document discusses the three present tenses in English: 1) The present simple is used for general actions and states. It forms the third person singular with -s. 2) The present continuous uses the present form of "be" plus the -ing form of the verb and expresses temporary actions or arrangements. 3) The present perfect uses have/has plus the past participle and refers to unfinished periods of time or experiences up until now. Examples are provided for the formation and use of each tense.