The past tense of duff is duffed
| Infinitive | to duff |
| Present Tense | duff / duffs |
| Past Tense | duffed |
| Present Participle | duffing |
| Past Participle | duffed |
| Singular | Plural |
|---|---|
| I duff | We duff |
| You duff | You duff |
| He/She/It duffs | They duff |
| Singular | Plural |
|---|---|
| I am duffing | We are duffing |
| You are duffing | You are duffing |
| He/She/It is duffing | They are duffing |
| Singular | Plural |
|---|---|
| I have duffed | We have duffed |
| You have duffed | You have duffed |
| He/She/It has duffed | They have duffed |
| Singular | Plural |
|---|---|
| I have been duffing | We have been duffing |
| You have been duffing | You have been duffing |
| He/She/It has been duffing | They have been duffing |
| Singular | Plural |
|---|---|
| I duffed | We duffed |
| You duffed | You duffed |
| He/She/It duffed | They duffed |
| Singular | Plural |
|---|---|
| I was duffing | We were duffing |
| You were duffing | You were duffing |
| He/She/It was duffing | They were duffing |
| Singular | Plural |
|---|---|
| I had duffed | We had duffed |
| You had duffed | You had duffed |
| He/She/It had duffed | They had duffed |
| Singular | Plural |
|---|---|
| I had been duffing | We had been duffing |
| You had been duffing | You had been duffing |
| He/She/It had been duffing | They had been duffing |
| Singular | Plural |
|---|---|
| I will duff | We will duff |
| You will duff | You will duff |
| He/She/It will duff | They will duff |
| Singular | Plural |
|---|---|
| I will be duffing | We will be duffing |
| You will be duffing | You will be duffing |
| He/She/It will be duffing | They will be duffing |
| Singular | Plural |
|---|---|
| I will have duffed | We will have duffed |
| You will have duffed | You will have duffed |
| He/She/It will have duffed | They will have duffed |
| Singular | Plural |
|---|---|
| I will have been duffing | We will have been duffing |
| You will have been duffing | You will have been duffing |
| He/She/It will have been duffing | They will have been duffing |
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