I could billow you could billow he could billow we could billow you could billow they could billow
Forma con V-ing
I could be billowing you could be billowing he could be billowing we could be billowing you could be billowing they could be billowing
Perfecto
I could have billowed you could have billowed he could have billowed we could have billowed you could have billowed they could have billowed
Perfecto con V-ing
I could have been billowing you could have been billowing he could have been billowing we could have been billowing you could have been billowing they could have been billowing
Negación
Forma simple
I could not billow you could not billow he could not billow we could not billow you could not billow they could not billow
Forma con V-ing
I could not be billowing you could not be billowing he could not be billowing we could not be billowing you could not be billowing they could not be billowing
Perfecto
I could not have billowed you could not have billowed he could not have billowed we could not have billowed you could not have billowed they could not have billowed
Perfecto con V-ing
I could not have been billowing you could not have been billowing he could not have been billowing we could not have been billowing you could not have been billowing they could not have been billowing
Forma interrogativa
Forma simple
could I billow? could you billow? could he billow? could we billow? could you billow? could they billow?
Forma con V-ing
could I be billowing? could you be billowing? could he be billowing? could we be billowing? could you be billowing? could they be billowing?
Perfecto
could I have billowed? could you have billowed? could he have billowed? could we have billowed? could you have billowed? could they have billowed?
Perfecto con V-ing
could I have been billowing? could you have been billowing? could he have been billowing? could we have been billowing? could you have been billowing? could they have been billowing?
Forma interro-negativa
Forma simple
could I not billow? could you not billow? could he not billow? could we not billow? could you not billow? could they not billow?
Forma con V-ing
could I not be billowing? could you not be billowing? could he not be billowing? could we not be billowing? could you not be billowing? could they not be billowing?
Perfecto
could I not have billowed? could you not have billowed? could he not have billowed? could we not have billowed? could you not have billowed? could they not have billowed?
Perfecto con V-ing
could I not have been billowing? could you not have been billowing? could he not have been billowing? could we not have been billowing? could you not have been billowing? could they not have been billowing?