| jiū | after all/to investigate/to study carefully/Taiwan pr. jiu4 |
| 究 | after all to investigate to study carefully |
| 究其实 | Investigate into the real situation. |
| 究其根源 | to trace something to its source (idiom) |
| 究办 | to investigate and deal with |
| 究根儿 | trace to the source |
| 究竟 | after all (when all is said and done) actually outcome |
| 究诘 | interrogate; cross-examine |
| 究问 | investigate and question |