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