The past tense of jack-knife is jack-knifed
| Infinitive | to jack-knife |
| Present Tense | jack-knife / jack-knifes |
| Past Tense | jack-knifed |
| Present Participle | jack-knifing |
| Past Participle | jack-knifed |
| Singular | Plural |
|---|---|
| I jack-knife | We jack-knife |
| You jack-knife | You jack-knife |
| He/She/It jack-knifes | They jack-knife |
| Singular | Plural |
|---|---|
| I am jack-knifing | We are jack-knifing |
| You are jack-knifing | You are jack-knifing |
| He/She/It is jack-knifing | They are jack-knifing |
| Singular | Plural |
|---|---|
| I have jack-knifed | We have jack-knifed |
| You have jack-knifed | You have jack-knifed |
| He/She/It has jack-knifed | They have jack-knifed |
| Singular | Plural |
|---|---|
| I have been jack-knifing | We have been jack-knifing |
| You have been jack-knifing | You have been jack-knifing |
| He/She/It has been jack-knifing | They have been jack-knifing |
| Singular | Plural |
|---|---|
| I jack-knifed | We jack-knifed |
| You jack-knifed | You jack-knifed |
| He/She/It jack-knifed | They jack-knifed |
| Singular | Plural |
|---|---|
| I was jack-knifing | We were jack-knifing |
| You were jack-knifing | You were jack-knifing |
| He/She/It was jack-knifing | They were jack-knifing |
| Singular | Plural |
|---|---|
| I had jack-knifed | We had jack-knifed |
| You had jack-knifed | You had jack-knifed |
| He/She/It had jack-knifed | They had jack-knifed |
| Singular | Plural |
|---|---|
| I had been jack-knifing | We had been jack-knifing |
| You had been jack-knifing | You had been jack-knifing |
| He/She/It had been jack-knifing | They had been jack-knifing |
| Singular | Plural |
|---|---|
| I will jack-knife | We will jack-knife |
| You will jack-knife | You will jack-knife |
| He/She/It will jack-knife | They will jack-knife |
| Singular | Plural |
|---|---|
| I will be jack-knifing | We will be jack-knifing |
| You will be jack-knifing | You will be jack-knifing |
| He/She/It will be jack-knifing | They will be jack-knifing |
| Singular | Plural |
|---|---|
| I will have jack-knifed | We will have jack-knifed |
| You will have jack-knifed | You will have jack-knifed |
| He/She/It will have jack-knifed | They will have jack-knifed |
| Singular | Plural |
|---|---|
| I will have been jack-knifing | We will have been jack-knifing |
| You will have been jack-knifing | You will have been jack-knifing |
| He/She/It will have been jack-knifing | They will have been jack-knifing |
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