| I | undo |
|---|---|
| you | undo |
| he/she/it | undoes |
| we | undo |
| you | undo |
| they | undo |
| I | undid |
|---|---|
| you | undid |
| he/she/it | undid |
| we | undid |
| you | undid |
| they | undid |
| I | have | undone |
|---|---|---|
| you | have | undone |
| he/she/it | has | undone |
| we | have | undone |
| you | have | undone |
| they | have | undone |
| I | had | undone |
|---|---|---|
| you | had | undone |
| he/she/it | had | undone |
| we | had | undone |
| you | had | undone |
| they | had | undone |
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单语范例（未经PONS编辑处理）
This proved to be their undoing as there were no younger members to sustain the farm.
en.wikipedia.org Through the first half of the 20th century most amusement parks had this type of fun house, but its free-form design was its undoing.
en.wikipedia.org It is also widely believed to have been the main factor in the show's undoing.
en.wikipedia.org As she dies, she informs him that he'll be led to his son by a boy who will also be his undoing.
en.wikipedia.org This preference for modern agricultural tools, however, became his undoing.
en.wikipedia.org