I could exercise you could exercise he could exercise we could exercise you could exercise they could exercise
Forma con V-ing
I could be exercising you could be exercising he could be exercising we could be exercising you could be exercising they could be exercising
Perfecto
I could have exercised you could have exercised he could have exercised we could have exercised you could have exercised they could have exercised
Perfecto con V-ing
I could have been exercising you could have been exercising he could have been exercising we could have been exercising you could have been exercising they could have been exercising
Negación
Forma simple
I couldn't exercise you couldn't exercise he couldn't exercise we couldn't exercise you couldn't exercise they couldn't exercise
Forma con V-ing
I couldn't be exercising you couldn't be exercising he couldn't be exercising we couldn't be exercising you couldn't be exercising they couldn't be exercising
Perfecto
I couldn't have exercised you couldn't have exercised he couldn't have exercised we couldn't have exercised you couldn't have exercised they couldn't have exercised
Perfecto con V-ing
I couldn't have been exercising you couldn't have been exercising he couldn't have been exercising we couldn't have been exercising you couldn't have been exercising they couldn't have been exercising
Forma interrogativa
Forma simple
could I exercise? could you exercise? could he exercise? could we exercise? could you exercise? could they exercise?
Forma con V-ing
could I be exercising? could you be exercising? could he be exercising? could we be exercising? could you be exercising? could they be exercising?
Perfecto
could I have exercised? could you have exercised? could he have exercised? could we have exercised? could you have exercised? could they have exercised?
Perfecto con V-ing
could I have been exercising? could you have been exercising? could he have been exercising? could we have been exercising? could you have been exercising? could they have been exercising?
Forma interro-negativa
Forma simple
couldn't I exercise? couldn't you exercise? couldn't he exercise? couldn't we exercise? couldn't you exercise? couldn't they exercise?
Forma con V-ing
couldn't I be exercising? couldn't you be exercising? couldn't he be exercising? couldn't we be exercising? couldn't you be exercising? couldn't they be exercising?
Perfecto
couldn't I have exercised? couldn't you have exercised? couldn't he have exercised? couldn't we have exercised? couldn't you have exercised? couldn't they have exercised?
Perfecto con V-ing
couldn't I have been exercising? couldn't you have been exercising? couldn't he have been exercising? couldn't we have been exercising? couldn't you have been exercising? couldn't they have been exercising?