I could breathe you could breathe he could breathe we could breathe you could breathe they could breathe
Forma con V-ing
I could be breathing you could be breathing he could be breathing we could be breathing you could be breathing they could be breathing
Perfecto
I could have breathed you could have breathed he could have breathed we could have breathed you could have breathed they could have breathed
Perfecto con V-ing
I could have been breathing you could have been breathing he could have been breathing we could have been breathing you could have been breathing they could have been breathing
Negación
Forma simple
I could not breathe you could not breathe he could not breathe we could not breathe you could not breathe they could not breathe
Forma con V-ing
I could not be breathing you could not be breathing he could not be breathing we could not be breathing you could not be breathing they could not be breathing
Perfecto
I could not have breathed you could not have breathed he could not have breathed we could not have breathed you could not have breathed they could not have breathed
Perfecto con V-ing
I could not have been breathing you could not have been breathing he could not have been breathing we could not have been breathing you could not have been breathing they could not have been breathing
Forma interrogativa
Forma simple
could I breathe? could you breathe? could he breathe? could we breathe? could you breathe? could they breathe?
Forma con V-ing
could I be breathing? could you be breathing? could he be breathing? could we be breathing? could you be breathing? could they be breathing?
Perfecto
could I have breathed? could you have breathed? could he have breathed? could we have breathed? could you have breathed? could they have breathed?
Perfecto con V-ing
could I have been breathing? could you have been breathing? could he have been breathing? could we have been breathing? could you have been breathing? could they have been breathing?
Forma interro-negativa
Forma simple
could I not breathe? could you not breathe? could he not breathe? could we not breathe? could you not breathe? could they not breathe?
Forma con V-ing
could I not be breathing? could you not be breathing? could he not be breathing? could we not be breathing? could you not be breathing? could they not be breathing?
Perfecto
could I not have breathed? could you not have breathed? could he not have breathed? could we not have breathed? could you not have breathed? could they not have breathed?
Perfecto con V-ing
could I not have been breathing? could you not have been breathing? could he not have been breathing? could we not have been breathing? could you not have been breathing? could they not have been breathing?