can jackknife
Verbo regular: jackknife - jackknifed- jackknifed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can jackknife
you can jackknife
he can jackknife
we can jackknife
you can jackknife
they can jackknife 	I can be jackknifing
you can be jackknifing
he can be jackknifing
we can be jackknifing
you can be jackknifing
they can be jackknifing	I can have jackknifed
you can have jackknifed
he can have jackknifed
we can have jackknifed
you can have jackknifed
they can have jackknifed	I can have been jackknifing
you can have been jackknifing
he can have been jackknifing
we can have been jackknifing
you can have been jackknifing
they can have been jackknifing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot jackknife
you cannot jackknife
he cannot jackknife
we cannot jackknife
you cannot jackknife
they cannot jackknife 	I cannot be jackknifing
you cannot be jackknifing
he cannot be jackknifing
we cannot be jackknifing
you cannot be jackknifing
they cannot be jackknifing	I cannot have jackknifed
you cannot have jackknifed
he cannot have jackknifed
we cannot have jackknifed
you cannot have jackknifed
they cannot have jackknifed	I cannot have been jackknifing
you cannot have been jackknifing
he cannot have been jackknifing
we cannot have been jackknifing
you cannot have been jackknifing
they cannot have been jackknifing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I jackknife?
can you jackknife?
can he jackknife?
can we jackknife?
can you jackknife?
can they jackknife? 	can I be jackknifing?
can you be jackknifing?
can he be jackknifing?
can we be jackknifing?
can you be jackknifing?
can they be jackknifing? 	can I have jackknifed?
can you have jackknifed?
can he have jackknifed?
can we have jackknifed?
can you have jackknifed?
can they have jackknifed? 	can I have been jackknifing?
can you have been jackknifing?
can he have been jackknifing?
can we have been jackknifing?
can you have been jackknifing?
can they have been jackknifing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not jackknife?
can you not jackknife?
can he not jackknife?
can we not jackknife?
can you not jackknife?
can they not jackknife? 	can I not be jackknifing?
can you not be jackknifing?
can he not be jackknifing?
can we not be jackknifing?
can you not be jackknifing?
can they not be jackknifing? 	can I not have jackknifed?
can you not have jackknifed?
can he not have jackknifed?
can we not have jackknifed?
can you not have jackknifed?
can they not have jackknifed? 	can I not have been jackknifing?
can you not have been jackknifing?
can he not have been jackknifing?
can we not have been jackknifing?
can you not have been jackknifing?
can they not have been jackknifing?