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