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