I could fast you could fast he could fast we could fast you could fast they could fast
Forma con V-ing
I could be fasting you could be fasting he could be fasting we could be fasting you could be fasting they could be fasting
Perfecto
I could have fasted you could have fasted he could have fasted we could have fasted you could have fasted they could have fasted
Perfecto con V-ing
I could have been fasting you could have been fasting he could have been fasting we could have been fasting you could have been fasting they could have been fasting
Negación
Forma simple
I could not fast you could not fast he could not fast we could not fast you could not fast they could not fast
Forma con V-ing
I could not be fasting you could not be fasting he could not be fasting we could not be fasting you could not be fasting they could not be fasting
Perfecto
I could not have fasted you could not have fasted he could not have fasted we could not have fasted you could not have fasted they could not have fasted
Perfecto con V-ing
I could not have been fasting you could not have been fasting he could not have been fasting we could not have been fasting you could not have been fasting they could not have been fasting
Forma interrogativa
Forma simple
could I fast? could you fast? could he fast? could we fast? could you fast? could they fast?
Forma con V-ing
could I be fasting? could you be fasting? could he be fasting? could we be fasting? could you be fasting? could they be fasting?
Perfecto
could I have fasted? could you have fasted? could he have fasted? could we have fasted? could you have fasted? could they have fasted?
Perfecto con V-ing
could I have been fasting? could you have been fasting? could he have been fasting? could we have been fasting? could you have been fasting? could they have been fasting?
Forma interro-negativa
Forma simple
could I not fast? could you not fast? could he not fast? could we not fast? could you not fast? could they not fast?
Forma con V-ing
could I not be fasting? could you not be fasting? could he not be fasting? could we not be fasting? could you not be fasting? could they not be fasting?
Perfecto
could I not have fasted? could you not have fasted? could he not have fasted? could we not have fasted? could you not have fasted? could they not have fasted?
Perfecto con V-ing
could I not have been fasting? could you not have been fasting? could he not have been fasting? could we not have been fasting? could you not have been fasting? could they not have been fasting?