should stack
Verbo regular: stack - stacked- stacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should stack
you should stack
she should stack
we should stack
you should stack
they should stack 	I should be stacking
you should be stacking
she should be stacking
we should be stacking
you should be stacking
they should be stacking	I should have stacked
you should have stacked
she should have stacked
we should have stacked
you should have stacked
they should have stacked	I should have been stacking
you should have been stacking
she should have been stacking
we should have been stacking
you should have been stacking
they should have been stacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not stack
you should not stack
she should not stack
we should not stack
you should not stack
they should not stack 	I should not be stacking
you should not be stacking
she should not be stacking
we should not be stacking
you should not be stacking
they should not be stacking	I should not have stacked
you should not have stacked
she should not have stacked
we should not have stacked
you should not have stacked
they should not have stacked	I should not have been stacking
you should not have been stacking
she should not have been stacking
we should not have been stacking
you should not have been stacking
they should not have been stacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I stack?
should you stack?
should she stack?
should we stack?
should you stack?
should they stack? 	should I be stacking?
should you be stacking?
should she be stacking?
should we be stacking?
should you be stacking?
should they be stacking? 	should I have stacked?
should you have stacked?
should she have stacked?
should we have stacked?
should you have stacked?
should they have stacked? 	should I have been stacking?
should you have been stacking?
should she have been stacking?
should we have been stacking?
should you have been stacking?
should they have been stacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not stack?
should you not stack?
should she not stack?
should we not stack?
should you not stack?
should they not stack? 	should I not be stacking?
should you not be stacking?
should she not be stacking?
should we not be stacking?
should you not be stacking?
should they not be stacking? 	should I not have stacked?
should you not have stacked?
should she not have stacked?
should we not have stacked?
should you not have stacked?
should they not have stacked? 	should I not have been stacking?
should you not have been stacking?
should she not have been stacking?
should we not have been stacking?
should you not have been stacking?
should they not have been stacking?