could sandpaper
Regular verb: sandpaper - sandpapered- sandpapered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sandpaper
you could sandpaper
he could sandpaper
we could sandpaper
you could sandpaper
they could sandpaper 	I could be sandpapering
you could be sandpapering
he could be sandpapering
we could be sandpapering
you could be sandpapering
they could be sandpapering	I could have sandpapered
you could have sandpapered
he could have sandpapered
we could have sandpapered
you could have sandpapered
they could have sandpapered	I could have been sandpapering
you could have been sandpapering
he could have been sandpapering
we could have been sandpapering
you could have been sandpapering
they could have been sandpapering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sandpaper
you couldn't sandpaper
he couldn't sandpaper
we couldn't sandpaper
you couldn't sandpaper
they couldn't sandpaper 	I couldn't be sandpapering
you couldn't be sandpapering
he couldn't be sandpapering
we couldn't be sandpapering
you couldn't be sandpapering
they couldn't be sandpapering	I couldn't have sandpapered
you couldn't have sandpapered
he couldn't have sandpapered
we couldn't have sandpapered
you couldn't have sandpapered
they couldn't have sandpapered	I couldn't have been sandpapering
you couldn't have been sandpapering
he couldn't have been sandpapering
we couldn't have been sandpapering
you couldn't have been sandpapering
they couldn't have been sandpapering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sandpaper?
could you sandpaper?
could he sandpaper?
could we sandpaper?
could you sandpaper?
could they sandpaper? 	could I be sandpapering?
could you be sandpapering?
could he be sandpapering?
could we be sandpapering?
could you be sandpapering?
could they be sandpapering? 	could I have sandpapered?
could you have sandpapered?
could he have sandpapered?
could we have sandpapered?
could you have sandpapered?
could they have sandpapered? 	could I have been sandpapering?
could you have been sandpapering?
could he have been sandpapering?
could we have been sandpapering?
could you have been sandpapering?
could they have been sandpapering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sandpaper?
couldn't you sandpaper?
couldn't he sandpaper?
couldn't we sandpaper?
couldn't you sandpaper?
couldn't they sandpaper? 	couldn't I be sandpapering?
couldn't you be sandpapering?
couldn't he be sandpapering?
couldn't we be sandpapering?
couldn't you be sandpapering?
couldn't they be sandpapering? 	couldn't I have sandpapered?
couldn't you have sandpapered?
couldn't he have sandpapered?
couldn't we have sandpapered?
couldn't you have sandpapered?
couldn't they have sandpapered? 	couldn't I have been sandpapering?
couldn't you have been sandpapering?
couldn't he have been sandpapering?
couldn't we have been sandpapering?
couldn't you have been sandpapering?
couldn't they have been sandpapering?