English verb conjugation
COULD BRUSH

Regular verb: brush - brushed - brushed

Affirmation

Simple form	V-ing form
I could brush you could brush he could brush we could brush you could brush they could brush	I could be brushing you could be brushing he could be brushing we could be brushing you could be brushing they could be brushing
Perfect	V-ing perfect
I could have brushed you could have brushed he could have brushed we could have brushed you could have brushed they could have brushed	I could have been brushing you could have been brushing he could have been brushing we could have been brushing you could have been brushing they could have been brushing

Negation

Simple form	V-ing form
I could not brush you could not brush he could not brush we could not brush you could not brush they could not brush	I could not be brushing you could not be brushing he could not be brushing we could not be brushing you could not be brushing they could not be brushing
Perfect	V-ing perfect
I could not have brushed you could not have brushed he could not have brushed we could not have brushed you could not have brushed they could not have brushed	I could not have been brushing you could not have been brushing he could not have been brushing we could not have been brushing you could not have been brushing they could not have been brushing

Interrogative form

Simple form	V-ing form
could I brush? could you brush? could he brush? could we brush? could you brush? could they brush?	could I be brushing? could you be brushing? could he be brushing? could we be brushing? could you be brushing? could they be brushing?
Perfect	V-ing perfect
could I have brushed? could you have brushed? could he have brushed? could we have brushed? could you have brushed? could they have brushed?	could I have been brushing? could you have been brushing? could he have been brushing? could we have been brushing? could you have been brushing? could they have been brushing?

Interro-negative form

Simple form	V-ing form
could I not brush? could you not brush? could he not brush? could we not brush? could you not brush? could they not brush?	could I not be brushing? could you not be brushing? could he not be brushing? could we not be brushing? could you not be brushing? could they not be brushing?
Perfect	V-ing perfect
could I not have brushed? could you not have brushed? could he not have brushed? could we not have brushed? could you not have brushed? could they not have brushed?	could I not have been brushing? could you not have been brushing? could he not have been brushing? could we not have been brushing? could you not have been brushing? could they not have been brushing?