| 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 |
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单语范例（未经PONS编辑处理）
It has undergone several changes since it was first built.
en.wikipedia.org They are influenced by classic rock and heavy metal, and have undergone an overwhelming number of line-up changes.
en.wikipedia.org Since its designation, the route has undergone few changes.
en.wikipedia.org In the last few years this area has undergone major changes and developments, with the value of property increasing quite considerably.
en.wikipedia.org Until recently consisting mostly of tenements, the area has in recent years undergone much demolition.
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