Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could switch sth.off you could switch sth.off he could switch sth.off we could switch sth.off you could switch sth.off they could switch sth.off
V-ing form
I could be switch sth.offing you could be switch sth.offing he could be switch sth.offing we could be switch sth.offing you could be switch sth.offing they could be switch sth.offing
Perfect
I could have switch sth.offed you could have switch sth.offed he could have switch sth.offed we could have switch sth.offed you could have switch sth.offed they could have switch sth.offed
V-ing perfect
I could have been switch sth.offing you could have been switch sth.offing he could have been switch sth.offing we could have been switch sth.offing you could have been switch sth.offing they could have been switch sth.offing
Negation
Simple form
I couldn't switch sth.off you couldn't switch sth.off he couldn't switch sth.off we couldn't switch sth.off you couldn't switch sth.off they couldn't switch sth.off
V-ing form
I couldn't be switch sth.offing you couldn't be switch sth.offing he couldn't be switch sth.offing we couldn't be switch sth.offing you couldn't be switch sth.offing they couldn't be switch sth.offing
Perfect
I couldn't have switch sth.offed you couldn't have switch sth.offed he couldn't have switch sth.offed we couldn't have switch sth.offed you couldn't have switch sth.offed they couldn't have switch sth.offed
V-ing perfect
I couldn't have been switch sth.offing you couldn't have been switch sth.offing he couldn't have been switch sth.offing we couldn't have been switch sth.offing you couldn't have been switch sth.offing they couldn't have been switch sth.offing
Interrogative form
Simple form
could I switch sth.off? could you switch sth.off? could he switch sth.off? could we switch sth.off? could you switch sth.off? could they switch sth.off?
V-ing form
could I be switch sth.offing? could you be switch sth.offing? could he be switch sth.offing? could we be switch sth.offing? could you be switch sth.offing? could they be switch sth.offing?
Perfect
could I have switch sth.offed? could you have switch sth.offed? could he have switch sth.offed? could we have switch sth.offed? could you have switch sth.offed? could they have switch sth.offed?
V-ing perfect
could I have been switch sth.offing? could you have been switch sth.offing? could he have been switch sth.offing? could we have been switch sth.offing? could you have been switch sth.offing? could they have been switch sth.offing?
Interro-negative form
Simple form
couldn't I switch sth.off? couldn't you switch sth.off? couldn't he switch sth.off? couldn't we switch sth.off? couldn't you switch sth.off? couldn't they switch sth.off?
V-ing form
couldn't I be switch sth.offing? couldn't you be switch sth.offing? couldn't he be switch sth.offing? couldn't we be switch sth.offing? couldn't you be switch sth.offing? couldn't they be switch sth.offing?
Perfect
couldn't I have switch sth.offed? couldn't you have switch sth.offed? couldn't he have switch sth.offed? couldn't we have switch sth.offed? couldn't you have switch sth.offed? couldn't they have switch sth.offed?
V-ing perfect
couldn't I have been switch sth.offing? couldn't you have been switch sth.offing? couldn't he have been switch sth.offing? couldn't we have been switch sth.offing? couldn't you have been switch sth.offing? couldn't they have been switch sth.offing?