I could produce you could produce he could produce we could produce you could produce they could produce
Forma con V-ing
I could be producing you could be producing he could be producing we could be producing you could be producing they could be producing
Perfecto
I could have produced you could have produced he could have produced we could have produced you could have produced they could have produced
Perfecto con V-ing
I could have been producing you could have been producing he could have been producing we could have been producing you could have been producing they could have been producing
Negación
Forma simple
I could not produce you could not produce he could not produce we could not produce you could not produce they could not produce
Forma con V-ing
I could not be producing you could not be producing he could not be producing we could not be producing you could not be producing they could not be producing
Perfecto
I could not have produced you could not have produced he could not have produced we could not have produced you could not have produced they could not have produced
Perfecto con V-ing
I could not have been producing you could not have been producing he could not have been producing we could not have been producing you could not have been producing they could not have been producing
Forma interrogativa
Forma simple
could I produce? could you produce? could he produce? could we produce? could you produce? could they produce?
Forma con V-ing
could I be producing? could you be producing? could he be producing? could we be producing? could you be producing? could they be producing?
Perfecto
could I have produced? could you have produced? could he have produced? could we have produced? could you have produced? could they have produced?
Perfecto con V-ing
could I have been producing? could you have been producing? could he have been producing? could we have been producing? could you have been producing? could they have been producing?
Forma interro-negativa
Forma simple
could I not produce? could you not produce? could he not produce? could we not produce? could you not produce? could they not produce?
Forma con V-ing
could I not be producing? could you not be producing? could he not be producing? could we not be producing? could you not be producing? could they not be producing?
Perfecto
could I not have produced? could you not have produced? could he not have produced? could we not have produced? could you not have produced? could they not have produced?
Perfecto con V-ing
could I not have been producing? could you not have been producing? could he not have been producing? could we not have been producing? could you not have been producing? could they not have been producing?