I could gee you could gee he could gee we could gee you could gee they could gee
V-ing form
I could be geeing you could be geeing he could be geeing we could be geeing you could be geeing they could be geeing
Perfect
I could have geed you could have geed he could have geed we could have geed you could have geed they could have geed
V-ing perfect
I could have been geeing you could have been geeing he could have been geeing we could have been geeing you could have been geeing they could have been geeing
Negation
Simple form
I could not gee you could not gee he could not gee we could not gee you could not gee they could not gee
V-ing form
I could not be geeing you could not be geeing he could not be geeing we could not be geeing you could not be geeing they could not be geeing
Perfect
I could not have geed you could not have geed he could not have geed we could not have geed you could not have geed they could not have geed
V-ing perfect
I could not have been geeing you could not have been geeing he could not have been geeing we could not have been geeing you could not have been geeing they could not have been geeing
Interrogative form
Simple form
could I gee? could you gee? could he gee? could we gee? could you gee? could they gee?
V-ing form
could I be geeing? could you be geeing? could he be geeing? could we be geeing? could you be geeing? could they be geeing?
Perfect
could I have geed? could you have geed? could he have geed? could we have geed? could you have geed? could they have geed?
V-ing perfect
could I have been geeing? could you have been geeing? could he have been geeing? could we have been geeing? could you have been geeing? could they have been geeing?
Interro-negative form
Simple form
could I not gee? could you not gee? could he not gee? could we not gee? could you not gee? could they not gee?
V-ing form
could I not be geeing? could you not be geeing? could he not be geeing? could we not be geeing? could you not be geeing? could they not be geeing?
Perfect
could I not have geed? could you not have geed? could he not have geed? could we not have geed? could you not have geed? could they not have geed?
V-ing perfect
could I not have been geeing? could you not have been geeing? could he not have been geeing? could we not have been geeing? could you not have been geeing? could they not have been geeing?