I can wallpaper you can wallpaper he can wallpaper we can wallpaper you can wallpaper they can wallpaper
V-ing form
I can be wallpapering you can be wallpapering he can be wallpapering we can be wallpapering you can be wallpapering they can be wallpapering
Perfect
I can have wallpapered you can have wallpapered he can have wallpapered we can have wallpapered you can have wallpapered they can have wallpapered
V-ing perfect
I can have been wallpapering you can have been wallpapering he can have been wallpapering we can have been wallpapering you can have been wallpapering they can have been wallpapering
Negation
Simple form
I cannot wallpaper you cannot wallpaper he cannot wallpaper we cannot wallpaper you cannot wallpaper they cannot wallpaper
V-ing form
I cannot be wallpapering you cannot be wallpapering he cannot be wallpapering we cannot be wallpapering you cannot be wallpapering they cannot be wallpapering
Perfect
I cannot have wallpapered you cannot have wallpapered he cannot have wallpapered we cannot have wallpapered you cannot have wallpapered they cannot have wallpapered
V-ing perfect
I cannot have been wallpapering you cannot have been wallpapering he cannot have been wallpapering we cannot have been wallpapering you cannot have been wallpapering they cannot have been wallpapering
Interrogative form
Simple form
can I wallpaper? can you wallpaper? can he wallpaper? can we wallpaper? can you wallpaper? can they wallpaper?
V-ing form
can I be wallpapering? can you be wallpapering? can he be wallpapering? can we be wallpapering? can you be wallpapering? can they be wallpapering?
Perfect
can I have wallpapered? can you have wallpapered? can he have wallpapered? can we have wallpapered? can you have wallpapered? can they have wallpapered?
V-ing perfect
can I have been wallpapering? can you have been wallpapering? can he have been wallpapering? can we have been wallpapering? can you have been wallpapering? can they have been wallpapering?
Interro-negative form
Simple form
can I not wallpaper? can you not wallpaper? can he not wallpaper? can we not wallpaper? can you not wallpaper? can they not wallpaper?
V-ing form
can I not be wallpapering? can you not be wallpapering? can he not be wallpapering? can we not be wallpapering? can you not be wallpapering? can they not be wallpapering?
Perfect
can I not have wallpapered? can you not have wallpapered? can he not have wallpapered? can we not have wallpapered? can you not have wallpapered? can they not have wallpapered?
V-ing perfect
can I not have been wallpapering? can you not have been wallpapering? can he not have been wallpapering? can we not have been wallpapering? can you not have been wallpapering? can they not have been wallpapering?