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