The document discusses the simple present, past, and future tenses in English. It notes that the simple present tense is used to describe habits, routines, facts and instructions. There are two types of simple present sentences: verbal sentences with S+V1+O structure and nominal sentences with S+be+complement structure. The simple past tense uses V2 and did, and also has verbal and nominal sentence structures. The simple future tense uses will to talk about plans and predictions of future events. It provides examples of affirmative, negative and interrogative sentences for each tense.