I could update you could update he could update we could update you could update they could update
V-ing form
I could be updating you could be updating he could be updating we could be updating you could be updating they could be updating
Perfect
I could have updated you could have updated he could have updated we could have updated you could have updated they could have updated
V-ing perfect
I could have been updating you could have been updating he could have been updating we could have been updating you could have been updating they could have been updating
Negation
Simple form
I could not update you could not update he could not update we could not update you could not update they could not update
V-ing form
I could not be updating you could not be updating he could not be updating we could not be updating you could not be updating they could not be updating
Perfect
I could not have updated you could not have updated he could not have updated we could not have updated you could not have updated they could not have updated
V-ing perfect
I could not have been updating you could not have been updating he could not have been updating we could not have been updating you could not have been updating they could not have been updating
Interrogative form
Simple form
could I update? could you update? could he update? could we update? could you update? could they update?
V-ing form
could I be updating? could you be updating? could he be updating? could we be updating? could you be updating? could they be updating?
Perfect
could I have updated? could you have updated? could he have updated? could we have updated? could you have updated? could they have updated?
V-ing perfect
could I have been updating? could you have been updating? could he have been updating? could we have been updating? could you have been updating? could they have been updating?
Interro-negative form
Simple form
could I not update? could you not update? could he not update? could we not update? could you not update? could they not update?
V-ing form
could I not be updating? could you not be updating? could he not be updating? could we not be updating? could you not be updating? could they not be updating?
Perfect
could I not have updated? could you not have updated? could he not have updated? could we not have updated? could you not have updated? could they not have updated?
V-ing perfect
could I not have been updating? could you not have been updating? could he not have been updating? could we not have been updating? could you not have been updating? could they not have been updating?