I can wallpaper you can wallpaper she can wallpaper we can wallpaper you can wallpaper they can wallpaper
V-ing form
I can be wallpapering you can be wallpapering she can be wallpapering we can be wallpapering you can be wallpapering they can be wallpapering
Perfect
I can have wallpapered you can have wallpapered she 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 she can have been wallpapering we can have been wallpapering you can have been wallpapering they can have been wallpapering
Negation
Simple form
I can't wallpaper you can't wallpaper she can't wallpaper we can't wallpaper you can't wallpaper they can't wallpaper
V-ing form
I can't be wallpapering you can't be wallpapering she can't be wallpapering we can't be wallpapering you can't be wallpapering they can't be wallpapering
Perfect
I can't have wallpapered you can't have wallpapered she can't have wallpapered we can't have wallpapered you can't have wallpapered they can't have wallpapered
V-ing perfect
I can't have been wallpapering you can't have been wallpapering she can't have been wallpapering we can't have been wallpapering you can't have been wallpapering they can't have been wallpapering
Interrogative form
Simple form
can I wallpaper? can you wallpaper? can she wallpaper? can we wallpaper? can you wallpaper? can they wallpaper?
V-ing form
can I be wallpapering? can you be wallpapering? can she be wallpapering? can we be wallpapering? can you be wallpapering? can they be wallpapering?
Perfect
can I have wallpapered? can you have wallpapered? can she 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 she have been wallpapering? can we have been wallpapering? can you have been wallpapering? can they have been wallpapering?
Interro-negative form
Simple form
can't I wallpaper? can't you wallpaper? can't she wallpaper? can't we wallpaper? can't you wallpaper? can't they wallpaper?
V-ing form
can't I be wallpapering? can't you be wallpapering? can't she be wallpapering? can't we be wallpapering? can't you be wallpapering? can't they be wallpapering?
Perfect
can't I have wallpapered? can't you have wallpapered? can't she have wallpapered? can't we have wallpapered? can't you have wallpapered? can't they have wallpapered?
V-ing perfect
can't I have been wallpapering? can't you have been wallpapering? can't she have been wallpapering? can't we have been wallpapering? can't you have been wallpapering? can't they have been wallpapering?