| I | warn |
|---|---|
| you | warn |
| he/she/it | warns |
| we | warn |
| you | warn |
| they | warn |
| I | warned |
|---|---|
| you | warned |
| he/she/it | warned |
| we | warned |
| you | warned |
| they | warned |
| I | have | warned |
|---|---|---|
| you | have | warned |
| he/she/it | has | warned |
| we | have | warned |
| you | have | warned |
| they | have | warned |
| I | had | warned |
|---|---|---|
| you | had | warned |
| he/she/it | had | warned |
| we | had | warned |
| you | had | warned |
| they | had | warned |
单语范例（未经PONS编辑处理）
The school authorities ordered them to rectify a lot of the problems and warned the school that they could lose their government grant.
en.wikipedia.org People were warned to tune to television and radio broadcasts.
en.wikipedia.org As a spirit, however, she can not save him from the plot against him, try as she may to warn him.
en.wikipedia.org The woman warns the brothers that the other people are not like us.
en.wikipedia.org They then warn him not to tell their parents what they did.
en.wikipedia.org