I could swallow you could swallow he could swallow we could swallow you could swallow they could swallow
Forma con V-ing
I could be swallowing you could be swallowing he could be swallowing we could be swallowing you could be swallowing they could be swallowing
Perfecto
I could have swallowed you could have swallowed he could have swallowed we could have swallowed you could have swallowed they could have swallowed
Perfecto con V-ing
I could have been swallowing you could have been swallowing he could have been swallowing we could have been swallowing you could have been swallowing they could have been swallowing
Negación
Forma simple
I could not swallow you could not swallow he could not swallow we could not swallow you could not swallow they could not swallow
Forma con V-ing
I could not be swallowing you could not be swallowing he could not be swallowing we could not be swallowing you could not be swallowing they could not be swallowing
Perfecto
I could not have swallowed you could not have swallowed he could not have swallowed we could not have swallowed you could not have swallowed they could not have swallowed
Perfecto con V-ing
I could not have been swallowing you could not have been swallowing he could not have been swallowing we could not have been swallowing you could not have been swallowing they could not have been swallowing
Forma interrogativa
Forma simple
could I swallow? could you swallow? could he swallow? could we swallow? could you swallow? could they swallow?
Forma con V-ing
could I be swallowing? could you be swallowing? could he be swallowing? could we be swallowing? could you be swallowing? could they be swallowing?
Perfecto
could I have swallowed? could you have swallowed? could he have swallowed? could we have swallowed? could you have swallowed? could they have swallowed?
Perfecto con V-ing
could I have been swallowing? could you have been swallowing? could he have been swallowing? could we have been swallowing? could you have been swallowing? could they have been swallowing?
Forma interro-negativa
Forma simple
could I not swallow? could you not swallow? could he not swallow? could we not swallow? could you not swallow? could they not swallow?
Forma con V-ing
could I not be swallowing? could you not be swallowing? could he not be swallowing? could we not be swallowing? could you not be swallowing? could they not be swallowing?
Perfecto
could I not have swallowed? could you not have swallowed? could he not have swallowed? could we not have swallowed? could you not have swallowed? could they not have swallowed?
Perfecto con V-ing
could I not have been swallowing? could you not have been swallowing? could he not have been swallowing? could we not have been swallowing? could you not have been swallowing? could they not have been swallowing?