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| ~아/어 (Lessons 5 and 6) | 두려워 |
| ~ㄴ/은 (Lesson 4) | 두려운 |
| ~ㄴ/는다 (Lesson 5) | – |
| ~ㅂ/습니다 (Lesson 6) | 두렵습니다 |
| ~ㄹ/을 (Lesson 9 and 26) | 두려울 |
| ~니 (Lesson 21) | 두렵니 |
| ~ㅁ/음 (Lesson 29) | 두려움 |
| ~(으)려니 | 두려우려니 |
| ~(으)시 (Lesson 39) | 두려우시 |
| ~(으)면 (Lesson 43) | 두려우면 |
| ~(으)니 (Lesson 81) | 두려우니 |
For an organized table of every verb and adjective in Unit 1, click here.