should stiff
Verbo regular: stiff - stiffed- stiffed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should stiff
you should stiff
he should stiff
we should stiff
you should stiff
they should stiff 	I should be stiffing
you should be stiffing
he should be stiffing
we should be stiffing
you should be stiffing
they should be stiffing	I should have stiffed
you should have stiffed
he should have stiffed
we should have stiffed
you should have stiffed
they should have stiffed	I should have been stiffing
you should have been stiffing
he should have been stiffing
we should have been stiffing
you should have been stiffing
they should have been stiffing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not stiff
you should not stiff
he should not stiff
we should not stiff
you should not stiff
they should not stiff 	I should not be stiffing
you should not be stiffing
he should not be stiffing
we should not be stiffing
you should not be stiffing
they should not be stiffing	I should not have stiffed
you should not have stiffed
he should not have stiffed
we should not have stiffed
you should not have stiffed
they should not have stiffed	I should not have been stiffing
you should not have been stiffing
he should not have been stiffing
we should not have been stiffing
you should not have been stiffing
they should not have been stiffing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I stiff?
should you stiff?
should he stiff?
should we stiff?
should you stiff?
should they stiff? 	should I be stiffing?
should you be stiffing?
should he be stiffing?
should we be stiffing?
should you be stiffing?
should they be stiffing? 	should I have stiffed?
should you have stiffed?
should he have stiffed?
should we have stiffed?
should you have stiffed?
should they have stiffed? 	should I have been stiffing?
should you have been stiffing?
should he have been stiffing?
should we have been stiffing?
should you have been stiffing?
should they have been stiffing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not stiff?
should you not stiff?
should he not stiff?
should we not stiff?
should you not stiff?
should they not stiff? 	should I not be stiffing?
should you not be stiffing?
should he not be stiffing?
should we not be stiffing?
should you not be stiffing?
should they not be stiffing? 	should I not have stiffed?
should you not have stiffed?
should he not have stiffed?
should we not have stiffed?
should you not have stiffed?
should they not have stiffed? 	should I not have been stiffing?
should you not have been stiffing?
should he not have been stiffing?
should we not have been stiffing?
should you not have been stiffing?
should they not have been stiffing?