The Chinese phrase "之乎者也" is formed by combining four distinct grammatical particles from Classical Chinese: 之 functions as a possessive marker or pronoun, 乎 serves as an interrogative or prepositional particle, 者 acts as a nominalizer that forms noun phrases, and 也 is a copulative particle used for assertions or emphasis. This juxtaposition results in a fixed expression that collectively represents the characteristic particles of Classical Chinese literary style.