ABSTRACT
Any factor that can be used as the criteria for classifying parts of speech must meet the following three conditions: The classification criteria include the three: the morphology of a word; its meaning; its grammatical function. This chapter deals with the three conditions for classifying parts of speech to examine whether the lexical meaning of a word can be used as criteria for classifying its parts of speech. A good many scholars recognize that the main basis for classifying parts of speech is the grammatical function of a word; however, they also emphasize that grammatical meaning is an important reference criterion. Some books say that equal attention should be paid to both function and meaning. The parts of speech classified according to the grammatical functions of a word are indeed grammatical, thereby meeting the first condition of the classification criteria.
