This video discusses how to use the present simple tense with third person pronouns "he", "she", and "it". It explains that the present simple is used for routine or habitual actions. It then provides examples of how to conjugate verbs ending in consonants, vowels, "ss", "x", "ch", "sh", or "o" for the third person. The video also demonstrates how to form negative sentences and questions in the third person present simple by adding "doesn't" or "does" respectively, without changing the base verb form.