I can rebuff you can rebuff he can rebuff we can rebuff you can rebuff they can rebuff
V-ing form
I can be rebuffing you can be rebuffing he can be rebuffing we can be rebuffing you can be rebuffing they can be rebuffing
Perfect
I can have rebuffed you can have rebuffed he can have rebuffed we can have rebuffed you can have rebuffed they can have rebuffed
V-ing perfect
I can have been rebuffing you can have been rebuffing he can have been rebuffing we can have been rebuffing you can have been rebuffing they can have been rebuffing
Negation
Simple form
I can't rebuff you can't rebuff he can't rebuff we can't rebuff you can't rebuff they can't rebuff
V-ing form
I can't be rebuffing you can't be rebuffing he can't be rebuffing we can't be rebuffing you can't be rebuffing they can't be rebuffing
Perfect
I can't have rebuffed you can't have rebuffed he can't have rebuffed we can't have rebuffed you can't have rebuffed they can't have rebuffed
V-ing perfect
I can't have been rebuffing you can't have been rebuffing he can't have been rebuffing we can't have been rebuffing you can't have been rebuffing they can't have been rebuffing
Interrogative form
Simple form
can I rebuff? can you rebuff? can he rebuff? can we rebuff? can you rebuff? can they rebuff?
V-ing form
can I be rebuffing? can you be rebuffing? can he be rebuffing? can we be rebuffing? can you be rebuffing? can they be rebuffing?
Perfect
can I have rebuffed? can you have rebuffed? can he have rebuffed? can we have rebuffed? can you have rebuffed? can they have rebuffed?
V-ing perfect
can I have been rebuffing? can you have been rebuffing? can he have been rebuffing? can we have been rebuffing? can you have been rebuffing? can they have been rebuffing?
Interro-negative form
Simple form
can't I rebuff? can't you rebuff? can't he rebuff? can't we rebuff? can't you rebuff? can't they rebuff?
V-ing form
can't I be rebuffing? can't you be rebuffing? can't he be rebuffing? can't we be rebuffing? can't you be rebuffing? can't they be rebuffing?
Perfect
can't I have rebuffed? can't you have rebuffed? can't he have rebuffed? can't we have rebuffed? can't you have rebuffed? can't they have rebuffed?
V-ing perfect
can't I have been rebuffing? can't you have been rebuffing? can't he have been rebuffing? can't we have been rebuffing? can't you have been rebuffing? can't they have been rebuffing?