I could fight you could fight he could fight we could fight you could fight they could fight
Forma con V-ing
I could be fighting you could be fighting he could be fighting we could be fighting you could be fighting they could be fighting
Perfecto
I could have fought you could have fought he could have fought we could have fought you could have fought they could have fought
Perfecto con V-ing
I could have been fighting you could have been fighting he could have been fighting we could have been fighting you could have been fighting they could have been fighting
Negación
Forma simple
I could not fight you could not fight he could not fight we could not fight you could not fight they could not fight
Forma con V-ing
I could not be fighting you could not be fighting he could not be fighting we could not be fighting you could not be fighting they could not be fighting
Perfecto
I could not have fought you could not have fought he could not have fought we could not have fought you could not have fought they could not have fought
Perfecto con V-ing
I could not have been fighting you could not have been fighting he could not have been fighting we could not have been fighting you could not have been fighting they could not have been fighting
Forma interrogativa
Forma simple
could I fight? could you fight? could he fight? could we fight? could you fight? could they fight?
Forma con V-ing
could I be fighting? could you be fighting? could he be fighting? could we be fighting? could you be fighting? could they be fighting?
Perfecto
could I have fought? could you have fought? could he have fought? could we have fought? could you have fought? could they have fought?
Perfecto con V-ing
could I have been fighting? could you have been fighting? could he have been fighting? could we have been fighting? could you have been fighting? could they have been fighting?
Forma interro-negativa
Forma simple
could I not fight? could you not fight? could he not fight? could we not fight? could you not fight? could they not fight?
Forma con V-ing
could I not be fighting? could you not be fighting? could he not be fighting? could we not be fighting? could you not be fighting? could they not be fighting?
Perfecto
could I not have fought? could you not have fought? could he not have fought? could we not have fought? could you not have fought? could they not have fought?
Perfecto con V-ing
could I not have been fighting? could you not have been fighting? could he not have been fighting? could we not have been fighting? could you not have been fighting? could they not have been fighting?