To fold in the middle, as a jackknife does.
Infinitivejack-knife
Past simplejack-knifed
Past participlejack-knifed
-ing formjack-knifing
Full conjugation of the English verb to jack-knife (past simple jack-knifed,
past participle jack-knifed):
present simple and continuous, past simple and continuous, present perfect, past perfect,
future, conditional, subjunctive and imperative, with all persons.
Indicative
Present simple
I
jack-knife
you
jack-knife
he/she/it
jack-knifes
we
jack-knife
you
jack-knife
they
jack-knife
Present continuous
I
am jack-knifing
you
are jack-knifing
he/she/it
is jack-knifing
we
are jack-knifing
you
are jack-knifing
they
are jack-knifing
Present perfect
I
have jack-knifed
you
have jack-knifed
he/she/it
has jack-knifed
we
have jack-knifed
you
have jack-knifed
they
have jack-knifed
Present perfect continuous
I
have been jack-knifing
you
have been jack-knifing
he/she/it
has been jack-knifing
we
have been jack-knifing
you
have been jack-knifing
they
have been jack-knifing
Past simple
I
jack-knifed
you
jack-knifed
he/she/it
jack-knifed
we
jack-knifed
you
jack-knifed
they
jack-knifed
Past continuous
I
was jack-knifing
you
were jack-knifing
he/she/it
was jack-knifing
we
were jack-knifing
you
were jack-knifing
they
were jack-knifing
Past perfect
I
had jack-knifed
you
had jack-knifed
he/she/it
had jack-knifed
we
had jack-knifed
you
had jack-knifed
they
had jack-knifed
Past perfect continuous
I
had been jack-knifing
you
had been jack-knifing
he/she/it
had been jack-knifing
we
had been jack-knifing
you
had been jack-knifing
they
had been jack-knifing
Future simple
I
will jack-knife
you
will jack-knife
he/she/it
will jack-knife
we
will jack-knife
you
will jack-knife
they
will jack-knife
Future continuous
I
will be jack-knifing
you
will be jack-knifing
he/she/it
will be jack-knifing
we
will be jack-knifing
you
will be jack-knifing
they
will be jack-knifing
Future perfect
I
will have jack-knifed
you
will have jack-knifed
he/she/it
will have jack-knifed
we
will have jack-knifed
you
will have jack-knifed
they
will have jack-knifed
Future perfect continuous
I
will have been jack-knifing
you
will have been jack-knifing
he/she/it
will have been jack-knifing
we
will have been jack-knifing
you
will have been jack-knifing
they
will have been jack-knifing
Conditional
Present
I
would jack-knife
you
would jack-knife
he/she/it
would jack-knife
we
would jack-knife
you
would jack-knife
they
would jack-knife
Present continuous
I
would be jack-knifing
you
would be jack-knifing
he/she/it
would be jack-knifing
we
would be jack-knifing
you
would be jack-knifing
they
would be jack-knifing
Perfect
I
would have jack-knifed
you
would have jack-knifed
he/she/it
would have jack-knifed
we
would have jack-knifed
you
would have jack-knifed
they
would have jack-knifed
Perfect continuous
I
would have been jack-knifing
you
would have been jack-knifing
he/she/it
would have been jack-knifing
we
would have been jack-knifing
you
would have been jack-knifing
they
would have been jack-knifing
Subjunctive
Present
that I
jack-knife
that you
jack-knife
that he/she/it
jack-knife
that we
jack-knife
that you
jack-knife
that they
jack-knife
Past
if I
jack-knifed
if you
jack-knifed
if he/she/it
jack-knifed
if we
jack-knifed
if you
jack-knifed
if they
jack-knifed
Imperative
Affirmative
you
jack-knife
we
let's jack-knife
Negative
you
don't jack-knife
we
let's not jack-knife
Non-finite forms
Infinitive
to jack-knife
Perfect infinitive
to have jack-knifed
Present participle / gerund
jack-knifing
Past participle
jack-knifed
Conjugations: Wiktionary (via kaikki.org), adapted, licensed under CC BY-SA 4.0.