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 couldn't brush you couldn't brush he couldn't brush we couldn't brush you couldn't brush they couldn't brush	I couldn't be brushing you couldn't be brushing he couldn't be brushing we couldn't be brushing you couldn't be brushing they couldn't be brushing
Perfect	V-ing perfect
I couldn't have brushed you couldn't have brushed he couldn't have brushed we couldn't have brushed you couldn't have brushed they couldn't have brushed	I couldn't have been brushing you couldn't have been brushing he couldn't have been brushing we couldn't have been brushing you couldn't have been brushing they couldn't 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
couldn't I brush? couldn't you brush? couldn't he brush? couldn't we brush? couldn't you brush? couldn't they brush?	couldn't I be brushing? couldn't you be brushing? couldn't he be brushing? couldn't we be brushing? couldn't you be brushing? couldn't they be brushing?
Perfect	V-ing perfect
couldn't I have brushed? couldn't you have brushed? couldn't he have brushed? couldn't we have brushed? couldn't you have brushed? couldn't they have brushed?	couldn't I have been brushing? couldn't you have been brushing? couldn't he have been brushing? couldn't we have been brushing? couldn't you have been brushing? couldn't they have been brushing?