I could tire you could tire she could tire we could tire you could tire they could tire
Forma con V-ing
I could be tiring you could be tiring she could be tiring we could be tiring you could be tiring they could be tiring
Perfecto
I could have tired you could have tired she could have tired we could have tired you could have tired they could have tired
Perfecto con V-ing
I could have been tiring you could have been tiring she could have been tiring we could have been tiring you could have been tiring they could have been tiring
Negación
Forma simple
I couldn't tire you couldn't tire she couldn't tire we couldn't tire you couldn't tire they couldn't tire
Forma con V-ing
I couldn't be tiring you couldn't be tiring she couldn't be tiring we couldn't be tiring you couldn't be tiring they couldn't be tiring
Perfecto
I couldn't have tired you couldn't have tired she couldn't have tired we couldn't have tired you couldn't have tired they couldn't have tired
Perfecto con V-ing
I couldn't have been tiring you couldn't have been tiring she couldn't have been tiring we couldn't have been tiring you couldn't have been tiring they couldn't have been tiring
Forma interrogativa
Forma simple
could I tire? could you tire? could she tire? could we tire? could you tire? could they tire?
Forma con V-ing
could I be tiring? could you be tiring? could she be tiring? could we be tiring? could you be tiring? could they be tiring?
Perfecto
could I have tired? could you have tired? could she have tired? could we have tired? could you have tired? could they have tired?
Perfecto con V-ing
could I have been tiring? could you have been tiring? could she have been tiring? could we have been tiring? could you have been tiring? could they have been tiring?
Forma interro-negativa
Forma simple
couldn't I tire? couldn't you tire? couldn't she tire? couldn't we tire? couldn't you tire? couldn't they tire?
Forma con V-ing
couldn't I be tiring? couldn't you be tiring? couldn't she be tiring? couldn't we be tiring? couldn't you be tiring? couldn't they be tiring?
Perfecto
couldn't I have tired? couldn't you have tired? couldn't she have tired? couldn't we have tired? couldn't you have tired? couldn't they have tired?
Perfecto con V-ing
couldn't I have been tiring? couldn't you have been tiring? couldn't she have been tiring? couldn't we have been tiring? couldn't you have been tiring? couldn't they have been tiring?