Conjugação do verbo inglês
COULD STACK

Verbo regular: stack - stacked - stacked

Afirmação

Forma simple	Forma com V-ing
I could stack you could stack she could stack we could stack you could stack they could stack	I could be stacking you could be stacking she could be stacking we could be stacking you could be stacking they could be stacking
Perfeito	Perfeito com V-ing
I could have stacked you could have stacked she 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 she could have been stacking we could have been stacking you could have been stacking they could have been stacking

Negação

Forma simple	Forma com V-ing
I couldn't stack you couldn't stack she 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 she couldn't be stacking we couldn't be stacking you couldn't be stacking they couldn't be stacking
Perfeito	Perfeito com V-ing
I couldn't have stacked you couldn't have stacked she 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 she 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 com V-ing
could I stack? could you stack? could she stack? could we stack? could you stack? could they stack?	could I be stacking? could you be stacking? could she be stacking? could we be stacking? could you be stacking? could they be stacking?
Perfeito	Perfeito com V-ing
could I have stacked? could you have stacked? could she 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 she have been stacking? could we have been stacking? could you have been stacking? could they have been stacking?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I stack? couldn't you stack? couldn't she 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 she be stacking? couldn't we be stacking? couldn't you be stacking? couldn't they be stacking?
Perfeito	Perfeito com V-ing
couldn't I have stacked? couldn't you have stacked? couldn't she 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 she have been stacking? couldn't we have been stacking? couldn't you have been stacking? couldn't they have been stacking?