would jackknife
Regular verb: jackknife - jackknifed- jackknifed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd jackknife
you'd jackknife
she'd jackknife
we'd jackknife
you'd jackknife
they'd jackknife 	I'd be jackknifing
you'd be jackknifing
she'd be jackknifing
we'd be jackknifing
you'd be jackknifing
they'd be jackknifing	I would've jackknifed
you would've jackknifed
she would've jackknifed
we would've jackknifed
you would've jackknifed
they would've jackknifed	I would've been jackknifing
you would've been jackknifing
she would've been jackknifing
we would've been jackknifing
you would've been jackknifing
they would've been jackknifing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I wouldn't jackknife
you wouldn't jackknife
she wouldn't jackknife
we wouldn't jackknife
you wouldn't jackknife
they wouldn't jackknife 	I wouldn't be jackknifing
you wouldn't be jackknifing
she wouldn't be jackknifing
we wouldn't be jackknifing
you wouldn't be jackknifing
they wouldn't be jackknifing	I wouldn't have jackknifed
you wouldn't have jackknifed
she wouldn't have jackknifed
we wouldn't have jackknifed
you wouldn't have jackknifed
they wouldn't have jackknifed	I wouldn't have been jackknifing
you wouldn't have been jackknifing
she wouldn't have been jackknifing
we wouldn't have been jackknifing
you wouldn't have been jackknifing
they wouldn't have been jackknifing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
would I jackknife?
would you jackknife?
would she jackknife?
would we jackknife?
would you jackknife?
would they jackknife? 	would I be jackknifing?
would you be jackknifing?
would she be jackknifing?
would we be jackknifing?
would you be jackknifing?
would they be jackknifing? 	would I have jackknifed?
would you have jackknifed?
would she have jackknifed?
would we have jackknifed?
would you have jackknifed?
would they have jackknifed? 	would I have been jackknifing?
would you have been jackknifing?
would she have been jackknifing?
would we have been jackknifing?
would you have been jackknifing?
would they have been jackknifing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
wouldn't I jackknife?
wouldn't you jackknife?
wouldn't she jackknife?
wouldn't we jackknife?
wouldn't you jackknife?
wouldn't they jackknife? 	wouldn't I be jackknifing?
wouldn't you be jackknifing?
wouldn't she be jackknifing?
wouldn't we be jackknifing?
wouldn't you be jackknifing?
wouldn't they be jackknifing? 	wouldn't I have jackknifed?
wouldn't you have jackknifed?
wouldn't she have jackknifed?
wouldn't we have jackknifed?
wouldn't you have jackknifed?
wouldn't they have jackknifed? 	wouldn't I have been jackknifing?
wouldn't you have been jackknifing?
wouldn't she have been jackknifing?
wouldn't we have been jackknifing?
wouldn't you have been jackknifing?
wouldn't they have been jackknifing?