I could erect you could erect she could erect we could erect you could erect they could erect
Forma con V-ing
I could be erecting you could be erecting she could be erecting we could be erecting you could be erecting they could be erecting
Perfecto
I could have erected you could have erected she could have erected we could have erected you could have erected they could have erected
Perfecto con V-ing
I could have been erecting you could have been erecting she could have been erecting we could have been erecting you could have been erecting they could have been erecting
Negación
Forma simple
I could not erect you could not erect she could not erect we could not erect you could not erect they could not erect
Forma con V-ing
I could not be erecting you could not be erecting she could not be erecting we could not be erecting you could not be erecting they could not be erecting
Perfecto
I could not have erected you could not have erected she could not have erected we could not have erected you could not have erected they could not have erected
Perfecto con V-ing
I could not have been erecting you could not have been erecting she could not have been erecting we could not have been erecting you could not have been erecting they could not have been erecting
Forma interrogativa
Forma simple
could I erect? could you erect? could she erect? could we erect? could you erect? could they erect?
Forma con V-ing
could I be erecting? could you be erecting? could she be erecting? could we be erecting? could you be erecting? could they be erecting?
Perfecto
could I have erected? could you have erected? could she have erected? could we have erected? could you have erected? could they have erected?
Perfecto con V-ing
could I have been erecting? could you have been erecting? could she have been erecting? could we have been erecting? could you have been erecting? could they have been erecting?
Forma interro-negativa
Forma simple
could I not erect? could you not erect? could she not erect? could we not erect? could you not erect? could they not erect?
Forma con V-ing
could I not be erecting? could you not be erecting? could she not be erecting? could we not be erecting? could you not be erecting? could they not be erecting?
Perfecto
could I not have erected? could you not have erected? could she not have erected? could we not have erected? could you not have erected? could they not have erected?
Perfecto con V-ing
could I not have been erecting? could you not have been erecting? could she not have been erecting? could we not have been erecting? could you not have been erecting? could they not have been erecting?