could wallpaper
Verbo regular: wallpaper - wallpapered- wallpapered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could wallpaper
you could wallpaper
he could wallpaper
we could wallpaper
you could wallpaper
they could wallpaper 	I could be wallpapering
you could be wallpapering
he could be wallpapering
we could be wallpapering
you could be wallpapering
they could be wallpapering	I could have wallpapered
you could have wallpapered
he could have wallpapered
we could have wallpapered
you could have wallpapered
they could have wallpapered	I could have been wallpapering
you could have been wallpapering
he could have been wallpapering
we could have been wallpapering
you could have been wallpapering
they could have been wallpapering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't wallpaper
you couldn't wallpaper
he couldn't wallpaper
we couldn't wallpaper
you couldn't wallpaper
they couldn't wallpaper 	I couldn't be wallpapering
you couldn't be wallpapering
he couldn't be wallpapering
we couldn't be wallpapering
you couldn't be wallpapering
they couldn't be wallpapering	I couldn't have wallpapered
you couldn't have wallpapered
he couldn't have wallpapered
we couldn't have wallpapered
you couldn't have wallpapered
they couldn't have wallpapered	I couldn't have been wallpapering
you couldn't have been wallpapering
he couldn't have been wallpapering
we couldn't have been wallpapering
you couldn't have been wallpapering
they couldn't have been wallpapering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I wallpaper?
could you wallpaper?
could he wallpaper?
could we wallpaper?
could you wallpaper?
could they wallpaper? 	could I be wallpapering?
could you be wallpapering?
could he be wallpapering?
could we be wallpapering?
could you be wallpapering?
could they be wallpapering? 	could I have wallpapered?
could you have wallpapered?
could he have wallpapered?
could we have wallpapered?
could you have wallpapered?
could they have wallpapered? 	could I have been wallpapering?
could you have been wallpapering?
could he have been wallpapering?
could we have been wallpapering?
could you have been wallpapering?
could they have been wallpapering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I wallpaper?
couldn't you wallpaper?
couldn't he wallpaper?
couldn't we wallpaper?
couldn't you wallpaper?
couldn't they wallpaper? 	couldn't I be wallpapering?
couldn't you be wallpapering?
couldn't he be wallpapering?
couldn't we be wallpapering?
couldn't you be wallpapering?
couldn't they be wallpapering? 	couldn't I have wallpapered?
couldn't you have wallpapered?
couldn't he have wallpapered?
couldn't we have wallpapered?
couldn't you have wallpapered?
couldn't they have wallpapered? 	couldn't I have been wallpapering?
couldn't you have been wallpapering?
couldn't he have been wallpapering?
couldn't we have been wallpapering?
couldn't you have been wallpapering?
couldn't they have been wallpapering?