Yet as an adverb. Yet is an adverb that refers to a period of time that begins in the past and ends in the present. In the present perfect, we mostly use it in negative statements or questions.
Using "Yet" as an Adverb To describe something that hasn't happened yet, use the word "yet." It is frequently used in negative statements where a negative term such as "have not" or "has not" is used, such as "I haven't completed my homework yet," or "I haven't eaten breakfast yet."
They are typically placed prior to the main verb but after auxiliary verbs (such as be, have, may, & must). Only when the main verb is "to be" does the adverb come after the main verb.
