This document discusses tenses in the English language. It begins by defining the present indefinite tense and providing an example sentence structure. It then outlines some rules for adding "s" or "es" to verbs in the third person singular present tense. Examples are given of positive and negative sentences using the present tense. The different verb conjugations for regular and irregular verbs in the present tense are explained. Identification and fill-in-the-blank exercises are provided to practice using correct tenses.