http://www.pons.de/produkte/3-12-517841-X/(牛津大学出版社授权产品)
在《PONS词典》中的词汇
| I | knock on |
|---|---|
| you | knock on |
| he/she/it | knocks on |
| we | knock on |
| you | knock on |
| they | knock on |
| I | knocked on |
|---|---|
| you | knocked on |
| he/she/it | knocked on |
| we | knocked on |
| you | knocked on |
| they | knocked on |
| I | have | knocked on |
|---|---|---|
| you | have | knocked on |
| he/she/it | has | knocked on |
| we | have | knocked on |
| you | have | knocked on |
| they | have | knocked on |
| I | had | knocked on |
|---|---|---|
| you | had | knocked on |
| he/she/it | had | knocked on |
| we | had | knocked on |
| you | had | knocked on |
| they | had | knocked on |