The document discusses the three main tenses - present, past and future. It provides details on how to form sentences in each tense using regular verbs. For each tense, it describes the simple, continuous, perfect and perfect continuous forms. For example, in the present tense the simple form uses the first verb form with the subject, in the past it uses the second verb form, and in the future it uses will/shall with the first verb form. The document also notes any changes needed for subjects like he/she/it.