| 曾经HSK 5 | céng jīng | once; already; former; previously; ever; (past tense marker used before verb or clause) | |
| 不曾 | bù céng | hasn't yet; hasn't ever | |
| 未曾 | wèi céng | hasn't (or haven't); hasn't ever | |
| 曾几何时 | céng jǐ hé shí | just a while before; not so long ago; everyone can remember when.. | |
| 似曾相识 | sì céng xiāng shí | déjà vu (the experience of seeing exactly the same situation a second time); seemingly familiar; apparently already acquainted |
| 曾孙 | zēng sūn | great-grandson | |
| 曾祖父 | zēng zǔ fù | father's father's father; paternal great-grandfather | |
| 曾祖母 | zēng zǔ mǔ | father's father's mother; paternal great-grandmother | |
| 曾祖 | zēng zǔ | great-grandfather (father of one's paternal grandfather) | |
| 曾参 | zēng shēn | Zeng Shen (505-435 BC), a.k.a. 曾子 |
| 1 | I have been to Beijing before. | |
| 2 | Have you ever been to China? | |
| 3 | I used to love listening to music. | |
| 4 | This was once the palace of the emperors. | |
| 5 | She used to be my good friend. |