I could switch you could switch she could switch we could switch you could switch they could switch
Forma con V-ing
I could be switching you could be switching she could be switching we could be switching you could be switching they could be switching
Perfecto
I could have switched you could have switched she could have switched we could have switched you could have switched they could have switched
Perfecto con V-ing
I could have been switching you could have been switching she could have been switching we could have been switching you could have been switching they could have been switching
Negación
Forma simple
I could not switch you could not switch she could not switch we could not switch you could not switch they could not switch
Forma con V-ing
I could not be switching you could not be switching she could not be switching we could not be switching you could not be switching they could not be switching
Perfecto
I could not have switched you could not have switched she could not have switched we could not have switched you could not have switched they could not have switched
Perfecto con V-ing
I could not have been switching you could not have been switching she could not have been switching we could not have been switching you could not have been switching they could not have been switching
Forma interrogativa
Forma simple
could I switch? could you switch? could she switch? could we switch? could you switch? could they switch?
Forma con V-ing
could I be switching? could you be switching? could she be switching? could we be switching? could you be switching? could they be switching?
Perfecto
could I have switched? could you have switched? could she have switched? could we have switched? could you have switched? could they have switched?
Perfecto con V-ing
could I have been switching? could you have been switching? could she have been switching? could we have been switching? could you have been switching? could they have been switching?
Forma interro-negativa
Forma simple
could I not switch? could you not switch? could she not switch? could we not switch? could you not switch? could they not switch?
Forma con V-ing
could I not be switching? could you not be switching? could she not be switching? could we not be switching? could you not be switching? could they not be switching?
Perfecto
could I not have switched? could you not have switched? could she not have switched? could we not have switched? could you not have switched? could they not have switched?
Perfecto con V-ing
could I not have been switching? could you not have been switching? could she not have been switching? could we not have been switching? could you not have been switching? could they not have been switching?