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| you | undergo |
| he/she/it | undergoes |
| we | undergo |
| you | undergo |
| they | undergo |
| I | underwent |
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| you | underwent |
| he/she/it | underwent |
| we | underwent |
| you | underwent |
| they | underwent |
| I | have | undergone |
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| you | have | undergone |
| he/she/it | has | undergone |
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| you | have | undergone |
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单语范例（未经PONS编辑处理）
It is believed that the entire yeast genome underwent duplication about 100 million years ago.
en.wikipedia.org His elbow felt better, and after the season underwent arthroscopic surgery.
en.wikipedia.org During this period, society and culture underwent fundamental changes.
en.wikipedia.org When his depression returned he underwent a second, much lengthier analysis and felt that he was much improved.
en.wikipedia.org He underwent a successful brain tumour operation in 1993 while his first marriage was failing.
en.wikipedia.org