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 couldn't switch you couldn't switch she couldn't switch we couldn't switch you couldn't switch they couldn't switch
Forma con V-ing
I couldn't be switching you couldn't be switching she couldn't be switching we couldn't be switching you couldn't be switching they couldn't be switching
Perfecto
I couldn't have switched you couldn't have switched she couldn't have switched we couldn't have switched you couldn't have switched they couldn't have switched
Perfecto con V-ing
I couldn't have been switching you couldn't have been switching she 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 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
couldn't I switch? couldn't you switch? couldn't she switch? couldn't we switch? couldn't you switch? couldn't they switch?
Forma con V-ing
couldn't I be switching? couldn't you be switching? couldn't she be switching? couldn't we be switching? couldn't you be switching? couldn't they be switching?
Perfecto
couldn't I have switched? couldn't you have switched? couldn't she have switched? couldn't we have switched? couldn't you have switched? couldn't they have switched?
Perfecto con V-ing
couldn't I have been switching? couldn't you have been switching? couldn't she have been switching? couldn't we have been switching? couldn't you have been switching? couldn't they have been switching?