This report put purpose on researching meaning segmentalization. In this report, speech act of ‘speaker’ asking ‘listener’ is defined as ‘Inquiry verb’ or ‘Inquiry’ type of discourse verb. On a basis of ‘Valance theory’, inquiry verb can be fall in to three categories of single position inquiry verb, double position inquiry verb, triple position inquiry verb by their innate combinable obligatory argument. Those types of inquiry verb is analyzed based on 『Korean Standard Unabridged Dictionary』 and 『Korea Dictionary』. The concept of ‘inquirer’, ‘quizee’, and ‘content of asking’ are the basic elements in researching concept of inquiry verb. Among them, ‘inquirer’ is the essential valency in the sense of they lead the articulation. However, ‘quizee’ and ‘content of asking’ can be defined as essential valencies or not based on which articulation they focus on. Therefore, in single position inquiry verb, ‘inquirer’ turns up to be essential valency. In double position inquiry verb, ‘content of asking’ and ‘quizee’ are selected to be essential valencies or not based on inquiry verbs meaning characteristics. In three position inquiry verb, ‘inquirer’, ‘quizee’, and ‘content of asking’ all turns up to be essential valencies. Based on each inquiry verbs meaning characteristic, ‘inquirer’, ‘quizee’, and ‘content of asking’ make selective constraint relation on predicate. Between ‘inquirer’ and ‘quizee’, sometimes constraint of social status show up. Also, each inquiry verbs show ‘method of question’, ‘attitude of question’, and ‘measure of question’ turns up in inquiry verb’s form-structure combined form. ‘Asking’ which means ‘act of question’ became central feature in combination of word, is made of syntax relationship of ‘modifier-predicate’, ‘predicate-modifier’, ‘predicate-object’. In structure which ‘Asking’ be the main feature, predicate usually shows inquirer’s attitude of asking and method of asking. In ‘modifier-object’ relationship, feature which perform object shows that ‘content of asking’ will have meaning selection constraint relationship in predicate. Research about concept of inquiry verb, research about predicate’s meaning relation of ‘inquirer’, ‘quizee’, ‘content of asking’, and research about inquiry verb’s morphologic construction afford grounds on researching meaning difference of inquiry verbs and extracting distinctive feature.