I. trail [treıl] 动词 不及物动词
| I | trail | 
|---|---|
| you | trail | 
| he/she/it | trails | 
| we | trail | 
| you | trail | 
| they | trail | 
| I | trailed | 
|---|---|
| you | trailed | 
| he/she/it | trailed | 
| we | trailed | 
| you | trailed | 
| they | trailed | 
| I | have | trailed | 
|---|---|---|
| you | have | trailed | 
| he/she/it | has | trailed | 
| we | have | trailed | 
| you | have | trailed | 
| they | have | trailed | 
| I | had | trailed | 
|---|---|---|
| you | had | trailed | 
| he/she/it | had | trailed | 
| we | had | trailed | 
| you | had | trailed | 
| they | had | trailed | 
