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| ~아/어 (Lessons 5 and 6) | 북적거려 |
| ~ㄴ/은 (Lesson 4) | 북적거린 |
| ~ㄴ/는다 (Lesson 5) | 북적거린다 |
| ~ㅂ/습니다 (Lesson 6) | 북적거립니다 |
| ~ㄹ/을 (Lesson 9 and 26) | 북적거릴 |
| ~니 (Lesson 21) | 북적거리니 |
| ~ㅁ/음 (Lesson 29) | 북적거림 |
| ~(으)려고 (Lesson 32) | 북적거리려고 |
| ~(으)시 (Lesson 39) | 북적거리시 |
| ~(으)면 (Lesson 43) | 북적거리면 |
| ~(으)니 (Lesson 81) | 북적거리니 |
For an organized table of every verb and adjective in Unit 2, click here.