I could gibber you could gibber she could gibber we could gibber you could gibber they could gibber
Forma con V-ing
I could be gibbering you could be gibbering she could be gibbering we could be gibbering you could be gibbering they could be gibbering
Perfecto
I could have gibbered you could have gibbered she could have gibbered we could have gibbered you could have gibbered they could have gibbered
Perfecto con V-ing
I could have been gibbering you could have been gibbering she could have been gibbering we could have been gibbering you could have been gibbering they could have been gibbering
Negación
Forma simple
I could not gibber you could not gibber she could not gibber we could not gibber you could not gibber they could not gibber
Forma con V-ing
I could not be gibbering you could not be gibbering she could not be gibbering we could not be gibbering you could not be gibbering they could not be gibbering
Perfecto
I could not have gibbered you could not have gibbered she could not have gibbered we could not have gibbered you could not have gibbered they could not have gibbered
Perfecto con V-ing
I could not have been gibbering you could not have been gibbering she could not have been gibbering we could not have been gibbering you could not have been gibbering they could not have been gibbering
Forma interrogativa
Forma simple
could I gibber? could you gibber? could she gibber? could we gibber? could you gibber? could they gibber?
Forma con V-ing
could I be gibbering? could you be gibbering? could she be gibbering? could we be gibbering? could you be gibbering? could they be gibbering?
Perfecto
could I have gibbered? could you have gibbered? could she have gibbered? could we have gibbered? could you have gibbered? could they have gibbered?
Perfecto con V-ing
could I have been gibbering? could you have been gibbering? could she have been gibbering? could we have been gibbering? could you have been gibbering? could they have been gibbering?
Forma interro-negativa
Forma simple
could I not gibber? could you not gibber? could she not gibber? could we not gibber? could you not gibber? could they not gibber?
Forma con V-ing
could I not be gibbering? could you not be gibbering? could she not be gibbering? could we not be gibbering? could you not be gibbering? could they not be gibbering?
Perfecto
could I not have gibbered? could you not have gibbered? could she not have gibbered? could we not have gibbered? could you not have gibbered? could they not have gibbered?
Perfecto con V-ing
could I not have been gibbering? could you not have been gibbering? could she not have been gibbering? could we not have been gibbering? could you not have been gibbering? could they not have been gibbering?