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