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