I could grumble you could grumble he could grumble we could grumble you could grumble they could grumble
Forma con V-ing
I could be grumbling you could be grumbling he could be grumbling we could be grumbling you could be grumbling they could be grumbling
Perfecto
I could have grumbled you could have grumbled he could have grumbled we could have grumbled you could have grumbled they could have grumbled
Perfecto con V-ing
I could have been grumbling you could have been grumbling he could have been grumbling we could have been grumbling you could have been grumbling they could have been grumbling
Negación
Forma simple
I could not grumble you could not grumble he could not grumble we could not grumble you could not grumble they could not grumble
Forma con V-ing
I could not be grumbling you could not be grumbling he could not be grumbling we could not be grumbling you could not be grumbling they could not be grumbling
Perfecto
I could not have grumbled you could not have grumbled he could not have grumbled we could not have grumbled you could not have grumbled they could not have grumbled
Perfecto con V-ing
I could not have been grumbling you could not have been grumbling he could not have been grumbling we could not have been grumbling you could not have been grumbling they could not have been grumbling
Forma interrogativa
Forma simple
could I grumble? could you grumble? could he grumble? could we grumble? could you grumble? could they grumble?
Forma con V-ing
could I be grumbling? could you be grumbling? could he be grumbling? could we be grumbling? could you be grumbling? could they be grumbling?
Perfecto
could I have grumbled? could you have grumbled? could he have grumbled? could we have grumbled? could you have grumbled? could they have grumbled?
Perfecto con V-ing
could I have been grumbling? could you have been grumbling? could he have been grumbling? could we have been grumbling? could you have been grumbling? could they have been grumbling?
Forma interro-negativa
Forma simple
could I not grumble? could you not grumble? could he not grumble? could we not grumble? could you not grumble? could they not grumble?
Forma con V-ing
could I not be grumbling? could you not be grumbling? could he not be grumbling? could we not be grumbling? could you not be grumbling? could they not be grumbling?
Perfecto
could I not have grumbled? could you not have grumbled? could he not have grumbled? could we not have grumbled? could you not have grumbled? could they not have grumbled?
Perfecto con V-ing
could I not have been grumbling? could you not have been grumbling? could he not have been grumbling? could we not have been grumbling? could you not have been grumbling? could they not have been grumbling?