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