I could barber you could barber she could barber we could barber you could barber they could barber
V-ing form
I could be barbering you could be barbering she could be barbering we could be barbering you could be barbering they could be barbering
Perfect
I could have barbered you could have barbered she could have barbered we could have barbered you could have barbered they could have barbered
V-ing perfect
I could have been barbering you could have been barbering she could have been barbering we could have been barbering you could have been barbering they could have been barbering
Negation
Simple form
I couldn't barber you couldn't barber she couldn't barber we couldn't barber you couldn't barber they couldn't barber
V-ing form
I couldn't be barbering you couldn't be barbering she couldn't be barbering we couldn't be barbering you couldn't be barbering they couldn't be barbering
Perfect
I couldn't have barbered you couldn't have barbered she couldn't have barbered we couldn't have barbered you couldn't have barbered they couldn't have barbered
V-ing perfect
I couldn't have been barbering you couldn't have been barbering she couldn't have been barbering we couldn't have been barbering you couldn't have been barbering they couldn't have been barbering
Interrogative form
Simple form
could I barber? could you barber? could she barber? could we barber? could you barber? could they barber?
V-ing form
could I be barbering? could you be barbering? could she be barbering? could we be barbering? could you be barbering? could they be barbering?
Perfect
could I have barbered? could you have barbered? could she have barbered? could we have barbered? could you have barbered? could they have barbered?
V-ing perfect
could I have been barbering? could you have been barbering? could she have been barbering? could we have been barbering? could you have been barbering? could they have been barbering?
Interro-negative form
Simple form
couldn't I barber? couldn't you barber? couldn't she barber? couldn't we barber? couldn't you barber? couldn't they barber?
V-ing form
couldn't I be barbering? couldn't you be barbering? couldn't she be barbering? couldn't we be barbering? couldn't you be barbering? couldn't they be barbering?
Perfect
couldn't I have barbered? couldn't you have barbered? couldn't she have barbered? couldn't we have barbered? couldn't you have barbered? couldn't they have barbered?
V-ing perfect
couldn't I have been barbering? couldn't you have been barbering? couldn't she have been barbering? couldn't we have been barbering? couldn't you have been barbering? couldn't they have been barbering?