The document discusses the words "already" and "yet". It states that "already" is used to indicate something happened earlier than expected, usually coming before or between verbs. "Yet" is used in questions or negatives to talk about things expected to happen before now but that occurred later than expected, usually coming at the end of sentences. Examples are provided for the use of each word. It also notes that the present perfect tense is usually used with "already" and "yet".