The document discusses various tenses in English including: 1) The simple present tense which is used to talk about habits, routines, facts, and for introducing yourself. 2) The simple past tense which expresses completed actions in the past. 3) The future tense which can be expressed using "will" to talk about voluntary actions or promises, and "be going to" to express plans. Both can also be used to make predictions. 4) Time clauses require the simple present rather than future tense.