I could nod you could nod she could nod we could nod you could nod they could nod
Forma con V-ing
I could be nodding you could be nodding she could be nodding we could be nodding you could be nodding they could be nodding
Perfecto
I could have nodded you could have nodded she could have nodded we could have nodded you could have nodded they could have nodded
Perfecto con V-ing
I could have been nodding you could have been nodding she could have been nodding we could have been nodding you could have been nodding they could have been nodding
Negación
Forma simple
I could not nod you could not nod she could not nod we could not nod you could not nod they could not nod
Forma con V-ing
I could not be nodding you could not be nodding she could not be nodding we could not be nodding you could not be nodding they could not be nodding
Perfecto
I could not have nodded you could not have nodded she could not have nodded we could not have nodded you could not have nodded they could not have nodded
Perfecto con V-ing
I could not have been nodding you could not have been nodding she could not have been nodding we could not have been nodding you could not have been nodding they could not have been nodding
Forma interrogativa
Forma simple
could I nod? could you nod? could she nod? could we nod? could you nod? could they nod?
Forma con V-ing
could I be nodding? could you be nodding? could she be nodding? could we be nodding? could you be nodding? could they be nodding?
Perfecto
could I have nodded? could you have nodded? could she have nodded? could we have nodded? could you have nodded? could they have nodded?
Perfecto con V-ing
could I have been nodding? could you have been nodding? could she have been nodding? could we have been nodding? could you have been nodding? could they have been nodding?
Forma interro-negativa
Forma simple
could I not nod? could you not nod? could she not nod? could we not nod? could you not nod? could they not nod?
Forma con V-ing
could I not be nodding? could you not be nodding? could she not be nodding? could we not be nodding? could you not be nodding? could they not be nodding?
Perfecto
could I not have nodded? could you not have nodded? could she not have nodded? could we not have nodded? could you not have nodded? could they not have nodded?
Perfecto con V-ing
could I not have been nodding? could you not have been nodding? could she not have been nodding? could we not have been nodding? could you not have been nodding? could they not have been nodding?