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