I could switch you could switch he could switch we could switch you could switch they could switch
Forma com V-ing
I could be switching you could be switching he could be switching we could be switching you could be switching they could be switching
Perfeito
I could have switched you could have switched he could have switched we could have switched you could have switched they could have switched
Perfeito com V-ing
I could have been switching you could have been switching he could have been switching we could have been switching you could have been switching they could have been switching
Negação
Forma simple
I could not switch you could not switch he could not switch we could not switch you could not switch they could not switch
Forma com V-ing
I could not be switching you could not be switching he could not be switching we could not be switching you could not be switching they could not be switching
Perfeito
I could not have switched you could not have switched he could not have switched we could not have switched you could not have switched they could not have switched
Perfeito com V-ing
I could not have been switching you could not have been switching he 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 he switch? could we switch? could you switch? could they switch?
Forma com V-ing
could I be switching? could you be switching? could he be switching? could we be switching? could you be switching? could they be switching?
Perfeito
could I have switched? could you have switched? could he have switched? could we have switched? could you have switched? could they have switched?
Perfeito com V-ing
could I have been switching? could you have been switching? could he have been switching? could we have been switching? could you have been switching? could they have been switching?
Forma interro-Negação
Forma simple
could I not switch? could you not switch? could he not switch? could we not switch? could you not switch? could they not switch?
Forma com V-ing
could I not be switching? could you not be switching? could he not be switching? could we not be switching? could you not be switching? could they not be switching?
Perfeito
could I not have switched? could you not have switched? could he not have switched? could we not have switched? could you not have switched? could they not have switched?
Perfeito com V-ing
could I not have been switching? could you not have been switching? could he not have been switching? could we not have been switching? could you not have been switching? could they not have been switching?