The morphemes of the conjunctive ending “-(eu)reo” can be analyzed as [“-(eu)r” + “-eo”]. “-(eu)reo” can be combined with the prefinal ending “-(eu)si-”, but cannot be combined with the prefinal endings “-eot-, -get-, -neu-, -deo-, -(eu)ri-”. And “-(eu)reo” can be combined with semantic particle. In the purpose conjunctive sentence, the basic meaning of the conjunctive ending “-(eu)reo” is to express the purpose of the movement of the subject's position such as coming or going. “-(eu)reo” can be used in sentences beginning with a proposal or an order. And when answering each other's questions in the dialogue, sometimes the following clause of the purpose conjunctive sentence of “-(eu)reo” can be omitted. The subject of the preceding clause in “-(eu)reo” purpose conjunctive sentence is always consistent with the subject of the following clause, and the subjects of the preceding and following clauses have the semantic feature of [+personality]. In the preceding clause of the purpose conjunctive sentence of “-(eu)reo”, the combination of “-(eu)reo” and action verbs is partially restricted, and the combination with moving verbs or adjectives is restricted. Moving verbs are generally used in the following clause of the purpose conjunctive sentence of “-(eu)reo”. “mueotareo” and “mwohareo” gradually become adverbial. The tense and aspect of the purpose conjunctive sentence of “-(eu)reo” are mainly reflected by the following clause. The following clause of the “-(eu)reo” purpose conjunctive sentence can be followed with the declarative sentence, the interrogative sentence, the imperative sentence, the propositive sentence and the exclamatory sentence. The negation of the following clause in the purpose conjunctive sentence of “-(eu)reo” is not restricted by “an, -ji anh-, mot, -ji mota-, -ji mal-”; the negation of the preceding clause is restricted by “an, -ji anh-, mot, -ji mota-”. A part of clause structure connected by “-(eu)reo” gradually shows the trend of “verb phrasization” or “composite verbization”.