| I | duff |
|---|---|
| you | duff |
| he/she/it | duffs |
| we | duff |
| you | duff |
| they | duff |
| I | duffed |
|---|---|
| you | duffed |
| he/she/it | duffed |
| we | duffed |
| you | duffed |
| they | duffed |
| I | have | duffed |
|---|---|---|
| you | have | duffed |
| he/she/it | has | duffed |
| we | have | duffed |
| you | have | duffed |
| they | have | duffed |
| I | had | duffed |
|---|---|---|
| you | had | duffed |
| he/she/it | had | duffed |
| we | had | duffed |
| you | had | duffed |
| they | had | duffed |
无例句可用
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