I could founder you could founder he could founder we could founder you could founder they could founder
Forma con V-ing
I could be foundering you could be foundering he could be foundering we could be foundering you could be foundering they could be foundering
Perfecto
I could have foundered you could have foundered he could have foundered we could have foundered you could have foundered they could have foundered
Perfecto con V-ing
I could have been foundering you could have been foundering he could have been foundering we could have been foundering you could have been foundering they could have been foundering
Negación
Forma simple
I could not founder you could not founder he could not founder we could not founder you could not founder they could not founder
Forma con V-ing
I could not be foundering you could not be foundering he could not be foundering we could not be foundering you could not be foundering they could not be foundering
Perfecto
I could not have foundered you could not have foundered he could not have foundered we could not have foundered you could not have foundered they could not have foundered
Perfecto con V-ing
I could not have been foundering you could not have been foundering he could not have been foundering we could not have been foundering you could not have been foundering they could not have been foundering
Forma interrogativa
Forma simple
could I founder? could you founder? could he founder? could we founder? could you founder? could they founder?
Forma con V-ing
could I be foundering? could you be foundering? could he be foundering? could we be foundering? could you be foundering? could they be foundering?
Perfecto
could I have foundered? could you have foundered? could he have foundered? could we have foundered? could you have foundered? could they have foundered?
Perfecto con V-ing
could I have been foundering? could you have been foundering? could he have been foundering? could we have been foundering? could you have been foundering? could they have been foundering?
Forma interro-negativa
Forma simple
could I not founder? could you not founder? could he not founder? could we not founder? could you not founder? could they not founder?
Forma con V-ing
could I not be foundering? could you not be foundering? could he not be foundering? could we not be foundering? could you not be foundering? could they not be foundering?
Perfecto
could I not have foundered? could you not have foundered? could he not have foundered? could we not have foundered? could you not have foundered? could they not have foundered?
Perfecto con V-ing
could I not have been foundering? could you not have been foundering? could he not have been foundering? could we not have been foundering? could you not have been foundering? could they not have been foundering?