I could stack you could stack he could stack we could stack you could stack they could stack
Forma con V-ing
I could be stacking you could be stacking he could be stacking we could be stacking you could be stacking they could be stacking
Perfetto
I could have stacked you could have stacked he could have stacked we could have stacked you could have stacked they could have stacked
Perfetto con V-ing
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
Negazione
Forma semplice
I couldn't stack you couldn't stack he couldn't stack we couldn't stack you couldn't stack they couldn't stack
Forma con V-ing
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
Perfetto
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
Perfetto con V-ing
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 semplice
could I stack? could you stack? could he stack? could we stack? could you stack? could they stack?
Forma con V-ing
could I be stacking? could you be stacking? could he be stacking? could we be stacking? could you be stacking? could they be stacking?
Perfetto
could I have stacked? could you have stacked? could he have stacked? could we have stacked? could you have stacked? could they have stacked?
Perfetto con V-ing
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 semplice
couldn't I stack? couldn't you stack? couldn't he stack? couldn't we stack? couldn't you stack? couldn't they stack?
Forma con V-ing
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?
Perfetto
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?
Perfetto con V-ing
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?