This presentation defines and provides examples of the use of "has/have" and "already/yet" in sentences. It explains that has/have is used to talk about a recent action and its results, following the structure of subject + has/have + past participle. It also distinguishes when to use has versus have. Additionally, it defines already to mean something expected happened earlier, while yet means something expected hasn't happened yet, and provides examples of sentences using these words. An activity asks the listener to make sentences using already/yet based on given scenarios.