Moon, Keum-Hyun. 2004. A Study on Types of Presupposition. Korean Semantics, 14. This study focuses on types of presupposition in the Korean language. Chapter 2, 3 give a basic discussion concerning the definition, characteristics and the various types of presupposition. This study classifies types of presupposition in Korean as fixed and fluctuating presupposition and arranges representative generating mechanisms that cause presupposition. The various types of Korean presupposition are lexical, morphological, syntactic, semantic and pragmatic. Chapter 4 examines presupposition generating mechanisms. First, this study presents prefix-derived words and constituent adverbs as representative generating mechanisms of lexical presupposition; particles, gerund final ending and subordinate conjunction endings as them of morphological presupposition; and quantifier sentences, cleft sentences and interrogative sentences as them of syntactical presupposition. Furthermore, semantic selectional restrictions are presented as them of semantic presupposition; and conversational participants, conversational situations, conversational maxims, courtesy speech, euphemism, expressions of indirect speech, and fixed ideas are presented as them of pragmatic presupposition. Using questionnaires, this study compares the differences of degree in which these generating mechanisms cause presupposition. The results of the questionnaires show that the generating mechanisms of lexical presupposition, including prefix-derived verbs, repetitive adverbs, descriptive adverbs, prefix-derived nouns and mimetic adverbs are the strongest generating mechanisms. This study verifies that the strength of presupposition derived from the lexical meaning of the vocabulary itself is greater than presupposition based on grammatical meaning in a sentence.