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