This English lesson focuses on verb conjugation in the present simple tense. Conjugation means changing a verb to agree with its subject. With subjects 'I,' 'you,' 'we,' and 'they,' the verb typically remains unchanged. However, when the subject is 'he,' 'she,' or 'it,' an 's' is usually added to the verb. Some verbs ending in -sh, -ch, -o, -s, -x, or -z require adding '-es' instead. The verbs 'be' and 'have' are exceptions and must be memorized due to their frequent use.