Daehanmunjeon(1908) consists of three grammatical unit system such as 'word-phrase-sentence'. The 'phrase' in this Daehanmunjeon(1908) refers to both a 'phrase' and a 'clause' in modern Korean grammar system. In this regard, the linguistic forms which are in the medium phase between a word and a sentence correspond to a 'phrase' in Daehanmunjeon(1908). There are three kinds of sentences--Danmun(단문), Bokmun(복문), and Yeon-gumun(연구문) in Daehanmunjeon(1908). Danmun is comprised of a 'subject' and a 'predicate' and Bokmun consists of two or more subjects and predicates. Yeongumun is comprised of a precedent clause and a following clause which are connected by a 'conjunctor'. It is hard to discriminate Yeongumun from Bokmun. The reason Deahnmunjeon(1908) only distinguishes between the simple sentence and the conjunction sentence in modern Korean grammar is mainly due to insufficient differentiation of grammatical units. However, the grammatical units of Daehanmunjeon(1909) are four unit system such as 'word-phrase-clause-sentence'. Daehanmunjeon(1909) systemically describes the types of sentences by establishing the different grammatical units, a 'phrase' and a 'clause'. There are three kinds of sentences-a simple sentence(Danmun), a complex sentence(Bokmun), and a duplex sentence(Jungmun) in Daehanmunjeon(1909). The simple sentence doesn't include the sentence having a 'clause' and the complex sentence includes the sentence involving additional clauses such as 'a nominal clause, an adjective clause or an adverbial clause'. The complex sentence corresponds to the matrix sentence which has a embedded sentence in modern Korean grammar. The duplex sentence which is applicant to the conjuncting complex sentence in modern Korean grammar involves an independent clause. The reason Daehanmunjeon(1909) could systemically describe the types of sentences is that it perceives the construction of a 'clause' and establishes a 'clause' as a distinct grammatical unit.