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| ~아/어 (Lessons 5 and 6) | 딱딱해 |
| ~ㄴ/은 (Lesson 4) | 딱딱한 |
| ~ㄴ/는다 (Lesson 5) | – |
| ~ㅂ/습니다 (Lesson 6) | 딱딱합니다 |
| ~ㄹ/을 (Lesson 9 and 26) | 딱딱할 |
| ~니 (Lesson 21) | 딱딱하니 |
| ~ㅁ/음 (Lesson 29) | 딱딱함 |
| ~(으)려니 | 딱딱하려니 |
| ~(으)시 (Lesson 39) | 딱딱하시 |
| ~(으)면 (Lesson 43) | 딱딱하면 |
| ~(으)니 (Lesson 81) | 딱딱하니 |
For an organized table of every verb and adjective in Unit 1, click here.