may stack
Verbo regular: stack - stacked- stacked

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

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mayn't stack
you mayn't stack
he mayn't stack
we mayn't stack
you mayn't stack
they mayn't stack 	I mayn't be stacking
you mayn't be stacking
he mayn't be stacking
we mayn't be stacking
you mayn't be stacking
they mayn't be stacking	I mayn't have stacked
you mayn't have stacked
he mayn't have stacked
we mayn't have stacked
you mayn't have stacked
they mayn't have stacked	I mayn't have been stacking
you mayn't have been stacking
he mayn't have been stacking
we mayn't have been stacking
you mayn't have been stacking
they mayn't have been stacking	

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

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mayn't I stack?
mayn't you stack?
mayn't he stack?
mayn't we stack?
mayn't you stack?
mayn't they stack? 	mayn't I be stacking?
mayn't you be stacking?
mayn't he be stacking?
mayn't we be stacking?
mayn't you be stacking?
mayn't they be stacking? 	mayn't I have stacked?
mayn't you have stacked?
mayn't he have stacked?
mayn't we have stacked?
mayn't you have stacked?
mayn't they have stacked? 	mayn't I have been stacking?
mayn't you have been stacking?
mayn't he have been stacking?
mayn't we have been stacking?
mayn't you have been stacking?
mayn't they have been stacking?