| I | prevent |
|---|---|
| you | prevent |
| he/she/it | prevents |
| we | prevent |
| you | prevent |
| they | prevent |
| I | prevented |
|---|---|
| you | prevented |
| he/she/it | prevented |
| we | prevented |
| you | prevented |
| they | prevented |
| I | have | prevented |
|---|---|---|
| you | have | prevented |
| he/she/it | has | prevented |
| we | have | prevented |
| you | have | prevented |
| they | have | prevented |
| I | had | prevented |
|---|---|---|
| you | had | prevented |
| he/she/it | had | prevented |
| we | had | prevented |
| you | had | prevented |
| they | had | prevented |
单语范例（未经PONS编辑处理）
To prevent this effect, police should separate witnesses as early as possible before the reporting of the event.
en.wikipedia.org Many file cabinets incorporate a keyed lock to prevent unauthorized access to the documents being stored.
en.wikipedia.org The next day, she took 3/36 from ten overs but it was not enough to prevent a five-wicket defeat.
en.wikipedia.org Their attempts to prevent ratification ultimately failed by a narrow vote of 30 to 27.
en.wikipedia.org Special care has to be taken, however, to prevent the tubers from contracting.
en.wikipedia.org