Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could grow up you could grow up he could grow up we could grow up you could grow up they could grow up
V-ing form
I could be grow uping you could be grow uping he could be grow uping we could be grow uping you could be grow uping they could be grow uping
Perfect
I could have grow uped you could have grow uped he could have grow uped we could have grow uped you could have grow uped they could have grow uped
V-ing perfect
I could have been grow uping you could have been grow uping he could have been grow uping we could have been grow uping you could have been grow uping they could have been grow uping
Negation
Simple form
I couldn't grow up you couldn't grow up he couldn't grow up we couldn't grow up you couldn't grow up they couldn't grow up
V-ing form
I couldn't be grow uping you couldn't be grow uping he couldn't be grow uping we couldn't be grow uping you couldn't be grow uping they couldn't be grow uping
Perfect
I couldn't have grow uped you couldn't have grow uped he couldn't have grow uped we couldn't have grow uped you couldn't have grow uped they couldn't have grow uped
V-ing perfect
I couldn't have been grow uping you couldn't have been grow uping he couldn't have been grow uping we couldn't have been grow uping you couldn't have been grow uping they couldn't have been grow uping
Interrogative form
Simple form
could I grow up? could you grow up? could he grow up? could we grow up? could you grow up? could they grow up?
V-ing form
could I be grow uping? could you be grow uping? could he be grow uping? could we be grow uping? could you be grow uping? could they be grow uping?
Perfect
could I have grow uped? could you have grow uped? could he have grow uped? could we have grow uped? could you have grow uped? could they have grow uped?
V-ing perfect
could I have been grow uping? could you have been grow uping? could he have been grow uping? could we have been grow uping? could you have been grow uping? could they have been grow uping?
Interro-negative form
Simple form
couldn't I grow up? couldn't you grow up? couldn't he grow up? couldn't we grow up? couldn't you grow up? couldn't they grow up?
V-ing form
couldn't I be grow uping? couldn't you be grow uping? couldn't he be grow uping? couldn't we be grow uping? couldn't you be grow uping? couldn't they be grow uping?
Perfect
couldn't I have grow uped? couldn't you have grow uped? couldn't he have grow uped? couldn't we have grow uped? couldn't you have grow uped? couldn't they have grow uped?
V-ing perfect
couldn't I have been grow uping? couldn't you have been grow uping? couldn't he have been grow uping? couldn't we have been grow uping? couldn't you have been grow uping? couldn't they have been grow uping?