| I | alert |
|---|---|
| you | alert |
| he/she/it | alerts |
| we | alert |
| you | alert |
| they | alert |
| I | alerted |
|---|---|
| you | alerted |
| he/she/it | alerted |
| we | alerted |
| you | alerted |
| they | alerted |
| I | have | alerted |
|---|---|---|
| you | have | alerted |
| he/she/it | has | alerted |
| we | have | alerted |
| you | have | alerted |
| they | have | alerted |
| I | had | alerted |
|---|---|---|
| you | had | alerted |
| he/she/it | had | alerted |
| we | had | alerted |
| you | had | alerted |
| they | had | alerted |
单语范例（未经PONS编辑处理）
However, after the first three tones, the alert went silent for about 30 seconds, then returned to normal programming.
en.wikipedia.org Either the operator is alerted when a mistake is about to be made, or the poka-yoke device actually prevents the mistake from being made.
en.wikipedia.org In a group there are more individuals to alert the group about an approaching predator.
en.wikipedia.org For the next month, she deployed with, keeping on the alert to spot downed pilots and to direct friendly helicopters to the rescue.
en.wikipedia.org State police said they received no calls related to the erroneous alert.
en.wikipedia.org