| I | yawn |
|---|---|
| you | yawn |
| he/she/it | yawns |
| we | yawn |
| you | yawn |
| they | yawn |
| I | yawned |
|---|---|
| you | yawned |
| he/she/it | yawned |
| we | yawned |
| you | yawned |
| they | yawned |
| I | have | yawned |
|---|---|---|
| you | have | yawned |
| he/she/it | has | yawned |
| we | have | yawned |
| you | have | yawned |
| they | have | yawned |
| I | had | yawned |
|---|---|---|
| you | had | yawned |
| he/she/it | had | yawned |
| we | had | yawned |
| you | had | yawned |
| they | had | yawned |
单语范例（未经PONS编辑处理）
Therefore, the contagious yawn could be an instinctual reaction to a signal from one member of the group reminding the others to stay alert.
en.wikipedia.org It has been suggested that the left periamygdalar region may play a role in yawning.
en.wikipedia.org Covering the mouth when yawning may have been a way to prevent such transmission.
en.wikipedia.org This album, though little distributed, was met with a yawn by the world and it has since been deleted, remanded to status of ambitious demo.
en.wikipedia.org Paratroopers have been noted to yawn in the moments before they exit the aircraft.
en.wikipedia.org