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 couldn't switch you couldn't switch he couldn't switch we couldn't switch you couldn't switch they couldn't switch
Forma com V-ing
I couldn't be switching you couldn't be switching he couldn't be switching we couldn't be switching you couldn't be switching they couldn't be switching
Perfeito
I couldn't have switched you couldn't have switched he couldn't have switched we couldn't have switched you couldn't have switched they couldn't have switched
Perfeito com V-ing
I couldn't have been switching you couldn't have been switching he couldn't have been switching we couldn't have been switching you couldn't have been switching they couldn't 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
couldn't I switch? couldn't you switch? couldn't he switch? couldn't we switch? couldn't you switch? couldn't they switch?
Forma com V-ing
couldn't I be switching? couldn't you be switching? couldn't he be switching? couldn't we be switching? couldn't you be switching? couldn't they be switching?
Perfeito
couldn't I have switched? couldn't you have switched? couldn't he have switched? couldn't we have switched? couldn't you have switched? couldn't they have switched?
Perfeito com V-ing
couldn't I have been switching? couldn't you have been switching? couldn't he have been switching? couldn't we have been switching? couldn't you have been switching? couldn't they have been switching?