A Korean conjunctive ending `-a/eoseo` shows a temporal relationship between the facts in the concluding clause and those of the preceding clause and is usually taught in a beginners` class. But, in most cases, it is hard for foreign learners to distinguish a usage of a conjunctive ending `-a/eoseo` from that of another similar conjunctive ending `-go`. This study starts from the hypothesis that the difference of these two grammatical items comes from the differences of their deep structures. Its aim is to show the syntactic features of conjunctive ending `-a/eoseo` and to suggest a lesson model, which will be helpful for both teachers and learners. Unlike conjunctive ending `-go`, `-a/eoseo` has some syntactic features as follows, (a) α, an element of a preceding clause, repeats in its following clause, (b) immediately precedes the verb of the preceding clause, and (c) usually omits in its following clause in the surface structure. In its lesson model, it is suggested to present the syntactic features of conjunctive ending `-a/eoseo` with visual aids to help learners understand its syntactic features more easily. And some activities to practice and use this grammatical item are also suggested to perform the tasks such as asking and answering one`s daily life or plan on a special day, asking for directions, inviting a friend to one`s house and giving a description of how to get to his/her house. In conclusion, conjunctive ending `-a/eoseo` and `-go` have different syntactic features in their deep structure. And, a teacher`s understanding the fact can help learners clarify the usage of these two grammatical items. (Dankook University)