Conjugación del verbo inglés
COULD STACK

Verbo regular: stack - stacked - stacked

Afirmación

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

Negación

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

Forma interrogativa

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

Forma interro-negativa

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