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