The document discusses the use of the future tense with will in English. It provides examples of will being used to express rapid decisions, predictions, offers, promises, and threats. It then covers the grammar rules for affirmative, negative, and interrogative sentences using will with subjects like I, you, we, she, and it. Examples are given for contractions, questions, and short answers. In under 3 sentences, the document covers the key uses and grammar of will in expressing future tense in English.