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 couldn't fast you couldn't fast he couldn't fast we couldn't fast you couldn't fast they couldn't fast
Forma con V-ing
I couldn't be fasting you couldn't be fasting he couldn't be fasting we couldn't be fasting you couldn't be fasting they couldn't be fasting
Perfecto
I couldn't have fasted you couldn't have fasted he couldn't have fasted we couldn't have fasted you couldn't have fasted they couldn't have fasted
Perfecto con V-ing
I couldn't have been fasting you couldn't have been fasting he couldn't have been fasting we couldn't have been fasting you couldn't have been fasting they couldn't 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
couldn't I fast? couldn't you fast? couldn't he fast? couldn't we fast? couldn't you fast? couldn't they fast?
Forma con V-ing
couldn't I be fasting? couldn't you be fasting? couldn't he be fasting? couldn't we be fasting? couldn't you be fasting? couldn't they be fasting?
Perfecto
couldn't I have fasted? couldn't you have fasted? couldn't he have fasted? couldn't we have fasted? couldn't you have fasted? couldn't they have fasted?
Perfecto con V-ing
couldn't I have been fasting? couldn't you have been fasting? couldn't he have been fasting? couldn't we have been fasting? couldn't you have been fasting? couldn't they have been fasting?