| 以 | 써 이, 쓸 이, 까닭 이, 함께 이, 거느릴 이, by means of; thereby, therefore; consider as; in order to (5) |
| 以內 | 이내 | within, less than |
| 以來 | 이래 | since, after that, hereafter |
| 以上 | 이상 | more than, above |
| 以熱治熱 | 이열치열 | Fight fire with fire, treat heat with heat (eat hot meals when it is hot) |
| 以外 | 이외 | except, apart from |
| 以前 | 이전 | formerly, previously, before |
| 以下 | 이하 | less than, below |
| 以後 | 이후 | after that |