English verb conjugation
COULD SANDPAPER

Regular verb: sandpaper - sandpapered - sandpapered

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not sandpaper you could not sandpaper he could not sandpaper we could not sandpaper you could not sandpaper they could not sandpaper	I could not be sandpapering you could not be sandpapering he could not be sandpapering we could not be sandpapering you could not be sandpapering they could not be sandpapering
Perfect	V-ing perfect
I could not have sandpapered you could not have sandpapered he could not have sandpapered we could not have sandpapered you could not have sandpapered they could not have sandpapered	I could not have been sandpapering you could not have been sandpapering he could not have been sandpapering we could not have been sandpapering you could not have been sandpapering they could not have been sandpapering

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not sandpaper? could you not sandpaper? could he not sandpaper? could we not sandpaper? could you not sandpaper? could they not sandpaper?	could I not be sandpapering? could you not be sandpapering? could he not be sandpapering? could we not be sandpapering? could you not be sandpapering? could they not be sandpapering?
Perfect	V-ing perfect
could I not have sandpapered? could you not have sandpapered? could he not have sandpapered? could we not have sandpapered? could you not have sandpapered? could they not have sandpapered?	could I not have been sandpapering? could you not have been sandpapering? could he not have been sandpapering? could we not have been sandpapering? could you not have been sandpapering? could they not have been sandpapering?