| I | undergo |
|---|---|
| you | undergo |
| he/she/it | undergoes |
| we | undergo |
| you | undergo |
| they | undergo |
| I | underwent |
|---|---|
| you | underwent |
| he/she/it | underwent |
| we | underwent |
| you | underwent |
| they | underwent |
| I | have | undergone |
|---|---|---|
| you | have | undergone |
| he/she/it | has | undergone |
| we | have | undergone |
| you | have | undergone |
| they | have | undergone |
| I | had | undergone |
|---|---|---|
| you | had | undergone |
| he/she/it | had | undergone |
| we | had | undergone |
| you | had | undergone |
| they | had | undergone |
单语范例（未经PONS编辑处理）
The resulting o-benzoylbenzoic acid then undergoes cyclization, forming anthraquinone.
en.wikipedia.org Navy 80-tonners did not undergo this rebuild.
en.wikipedia.org After crushing, the must usually undergoes a period of extended maceration that can last up to 30 days.
en.wikipedia.org He tells of his experiences and changes that he has undergone in his travels.
en.wikipedia.org It was undergoing modernisation under new ownership at the time of the fire.
en.wikipedia.org