| 知道HSK 2 | zhī dào | to know; to become aware of; also pr. [zhi1 dao5] | |
| 知识HSK 4 | zhī shi | knowledge; Classifiers: 门 ; intellectual | |
| 不知 | bù zhī | not to know; unaware; unknowingly; fig. not to admit (defeat, hardships, tiredness etc) | |
| 通知HSK 4 | tōng zhī | to notify; to inform; notice; notification; Classifiers: 个 | |
| 得知 | dé zhī | to find out; to know; to learn about |
| 1 | I really don't know. | |
| 2 | I don't know how to answer. | |
| 3 | I also don't know the answer. | |
| 4 | I don't know what to say. | |
| 5 | I don't know what to do. |