| I | duff up |
| you | duff up |
| he/she/it | duffs up |
| we | duff up |
| you | duff up |
| they | duff up |
| I | have duffed up |
| you | have duffed up |
| he/she/it | has duffed up |
| we | have duffed up |
| you | have duffed up |
| they | have duffed up |
| I | duffed up |
| you | duffed up |
| he/she/it | duffed up |
| we | duffed up |
| you | duffed up |
| they | duffed up |
| I | had duffed up |
| you | had duffed up |
| he/she/it | had duffed up |
| we | had duffed up |
| you | had duffed up |
| they | had duffed up |
| I | will duff up |
| you | will duff up |
| he/she/it | will duff up |
| we | will duff up |
| you | will duff up |
| they | will duff up |
| I | will have duffed up |
| you | will have duffed up |
| he/she/it | will have duffed up |
| we | will have duffed up |
| you | will have duffed up |
| they | will have duffed up |
| I | am duffing up |
| you | are duffing up |
| he/she/it | is duffing up |
| we | are duffing up |
| you | are duffing up |
| they | are duffing up |
| I | have been duffing up |
| you | have been duffing up |
| he/she/it | has been duffing up |
| we | have been duffing up |
| you | have been duffing up |
| they | have been duffing up |
| I | was duffing up |
| you | were duffing up |
| he/she/it | was duffing up |
| we | were duffing up |
| you | were duffing up |
| they | were duffing up |
| I | had been duffing up |
| you | had been duffing up |
| he/she/it | had been duffing up |
| we | had been duffing up |
| you | had been duffing up |
| they | had been duffing up |
| I | will be duffing up |
| you | will be duffing up |
| he/she/it | will be duffing up |
| we | will be duffing up |
| you | will be duffing up |
| they | will be duffing up |
| I | will have been duffing up |
| you | will have been duffing up |
| he/she/it | will have been duffing up |
| we | will have been duffing up |
| you | will have been duffing up |
| they | will have been duffing up |
| I | would duff up |
| you | would duff up |
| he/she/it | would duff up |
| we | would duff up |
| you | would duff up |
| they | would duff up |
| I | would have duffed up |
| you | would have duffed up |
| he/she/it | would have duffed up |
| we | would have duffed up |
| you | would have duffed up |
| they | would have duffed up |
| I | would be duffing up |
| you | would be duffing up |
| he/she/it | would be duffing up |
| we | would be duffing up |
| you | would be duffing up |
| they | would be duffing up |
| I | would have been duffing up |
| you | would have been duffing up |
| he/she/it | would have been duffing up |
| we | would have been duffing up |
| you | would have been duffing up |
| they | would have been duffing up |
| You | duff up |
| we | Let's duff up |
| You | duff up |