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