should jackknife
Verbo regular: jackknife - jackknifed- jackknifed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I'd jackknife
you'd jackknife
he'd jackknife
we'd jackknife
you'd jackknife
they'd jackknife 	I'd be jackknifing
you'd be jackknifing
he'd be jackknifing
we'd be jackknifing
you'd be jackknifing
they'd be jackknifing	I should've jackknifed
you should've jackknifed
he should've jackknifed
we should've jackknifed
you should've jackknifed
they should've jackknifed	I should've been jackknifing
you should've been jackknifing
he should've been jackknifing
we should've been jackknifing
you should've been jackknifing
they should've been jackknifing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I shouldn't jackknife
you shouldn't jackknife
he shouldn't jackknife
we shouldn't jackknife
you shouldn't jackknife
they shouldn't jackknife 	I shouldn't be jackknifing
you shouldn't be jackknifing
he shouldn't be jackknifing
we shouldn't be jackknifing
you shouldn't be jackknifing
they shouldn't be jackknifing	I shouldn't have jackknifed
you shouldn't have jackknifed
he shouldn't have jackknifed
we shouldn't have jackknifed
you shouldn't have jackknifed
they shouldn't have jackknifed	I shouldn't have been jackknifing
you shouldn't have been jackknifing
he shouldn't have been jackknifing
we shouldn't have been jackknifing
you shouldn't have been jackknifing
they shouldn't have been jackknifing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I jackknife?
should you jackknife?
should he jackknife?
should we jackknife?
should you jackknife?
should they jackknife? 	should I be jackknifing?
should you be jackknifing?
should he be jackknifing?
should we be jackknifing?
should you be jackknifing?
should they be jackknifing? 	should I have jackknifed?
should you have jackknifed?
should he have jackknifed?
should we have jackknifed?
should you have jackknifed?
should they have jackknifed? 	should I have been jackknifing?
should you have been jackknifing?
should he have been jackknifing?
should we have been jackknifing?
should you have been jackknifing?
should they have been jackknifing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
shouldn't I jackknife?
shouldn't you jackknife?
shouldn't he jackknife?
shouldn't we jackknife?
shouldn't you jackknife?
shouldn't they jackknife? 	shouldn't I be jackknifing?
shouldn't you be jackknifing?
shouldn't he be jackknifing?
shouldn't we be jackknifing?
shouldn't you be jackknifing?
shouldn't they be jackknifing? 	shouldn't I have jackknifed?
shouldn't you have jackknifed?
shouldn't he have jackknifed?
shouldn't we have jackknifed?
shouldn't you have jackknifed?
shouldn't they have jackknifed? 	shouldn't I have been jackknifing?
shouldn't you have been jackknifing?
shouldn't he have been jackknifing?
shouldn't we have been jackknifing?
shouldn't you have been jackknifing?
shouldn't they have been jackknifing?