I can switch you can switch he can switch we can switch you can switch they can switch
V-ing form
I can be switching you can be switching he can be switching we can be switching you can be switching they can be switching
Perfect
I can have switched you can have switched he can have switched we can have switched you can have switched they can have switched
V-ing perfect
I can have been switching you can have been switching he can have been switching we can have been switching you can have been switching they can have been switching
Negation
Simple form
I can't switch you can't switch he can't switch we can't switch you can't switch they can't switch
V-ing form
I can't be switching you can't be switching he can't be switching we can't be switching you can't be switching they can't be switching
Perfect
I can't have switched you can't have switched he can't have switched we can't have switched you can't have switched they can't have switched
V-ing perfect
I can't have been switching you can't have been switching he can't have been switching we can't have been switching you can't have been switching they can't have been switching
Interrogative form
Simple form
can I switch? can you switch? can he switch? can we switch? can you switch? can they switch?
V-ing form
can I be switching? can you be switching? can he be switching? can we be switching? can you be switching? can they be switching?
Perfect
can I have switched? can you have switched? can he have switched? can we have switched? can you have switched? can they have switched?
V-ing perfect
can I have been switching? can you have been switching? can he have been switching? can we have been switching? can you have been switching? can they have been switching?
Interro-negative form
Simple form
can't I switch? can't you switch? can't he switch? can't we switch? can't you switch? can't they switch?
V-ing form
can't I be switching? can't you be switching? can't he be switching? can't we be switching? can't you be switching? can't they be switching?
Perfect
can't I have switched? can't you have switched? can't he have switched? can't we have switched? can't you have switched? can't they have switched?
V-ing perfect
can't I have been switching? can't you have been switching? can't he have been switching? can't we have been switching? can't you have been switching? can't they have been switching?