Recently the number of enrolled foreign students in Korean universities greatly increased, but many of them don’t have the ability to write satisfactorily in Korean. Some students cannot even make a correct sentence in Korean. In university, they get a grade from many activities, especially examinations where a large portion of the grades are taken. Studying the grammar and expressions which are used in writing the answers is important. Also, teachers need to teach that so that the students will be equipped with the basic ability to pass these subjects. Therefore this study suggests the grammars and expressions which are used in writing answers for KAP learners. First, this study researched questions for exams of six subjects that are related to Korean and Teaching Korean for foreigners. Many students cannot write proper answers because of simply misunderstanding the questions. The questions are classified into five types; define, explain, discuss, describe, and analyze. And then find the method in writing answers from type of questions by researching the rubric. Second, this study analyzed students’ examination papers. It presented grammatical errors and expressions from students’ written text. Finally, it based on the results which researched the grammatical errors and problems of students’ examination papers. This study suggests the grammars and expressions to be used in writing expository-type sentences in answering questions during examinations. It will not only help the students in writing answers by using proper grammars and expressions to make correct sentences during examinations, but also help the teachers in teaching expository type writing style in Korean writing classes for Academic Purposes. Expository writing is important to foreigners because most of the examinations given to them by their Korean classes require them to describe and explain things that they study in their classes. (Hankuk University of Foreign Studies․The Ewha Womans University)