☆ ADVANCED LEVEL : 0 ☆☆ INTERMEDIATE LEVEL : 0 ☆☆☆ ELEMENTARY LEVEL : 0 NONE : 1 ALL : 1

• 기하급수 (幾何級數) : 수나 양이 매우 빠른 속도로 많아짐. Noun
🌏 GEOMETRIC PROGRESSION: Sharp increase in quantity or volume.

• Health (155) • Introducing (introducing oneself) (52) • Life in Korea (16) • Apologizing (7) • Expressing time (82) • Hobbies (48) • Expressing day of the week (13) • Residential area (159) • Purchasing goods (99) • Expressing emotion/feelings (41) • Using the hospital (204) • Using public institutions (library, post office, etc.) (8) • Using public institutions (59) • Life in the workplace (197) • Family events (57) • Human relationships (52) • Describing food (78) • Making a phone call (15) • Weekends and holidays (47) • Describing physical features (97) • Pop culture (82) • Architecture (43) • Press (36) • Environmental issues (226) • Politics (149) • Sports (88) • Introducing (introducing family) (41) • Hobby (103) • Family events (during national holidays) (2) • Expressing gratitude (8)