The document discusses the future perfect tense in English. The future perfect tense is used to refer to actions that will be completed by a certain time in the future. It is formed using will + have + past participle. Examples are provided of affirmative, negative, and interrogative sentences in the future perfect tense, along with common uses like talking about actions that will be finished by a certain time. Practice questions are provided at the end for readers to test their understanding of forming sentences in the future perfect tense.