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