I could hack you could hack he could hack we could hack you could hack they could hack
V-ing form
I could be hacking you could be hacking he could be hacking we could be hacking you could be hacking they could be hacking
Perfect
I could have hacked you could have hacked he could have hacked we could have hacked you could have hacked they could have hacked
V-ing perfect
I could have been hacking you could have been hacking he could have been hacking we could have been hacking you could have been hacking they could have been hacking
Negation
Simple form
I could not hack you could not hack he could not hack we could not hack you could not hack they could not hack
V-ing form
I could not be hacking you could not be hacking he could not be hacking we could not be hacking you could not be hacking they could not be hacking
Perfect
I could not have hacked you could not have hacked he could not have hacked we could not have hacked you could not have hacked they could not have hacked
V-ing perfect
I could not have been hacking you could not have been hacking he could not have been hacking we could not have been hacking you could not have been hacking they could not have been hacking
Interrogative form
Simple form
could I hack? could you hack? could he hack? could we hack? could you hack? could they hack?
V-ing form
could I be hacking? could you be hacking? could he be hacking? could we be hacking? could you be hacking? could they be hacking?
Perfect
could I have hacked? could you have hacked? could he have hacked? could we have hacked? could you have hacked? could they have hacked?
V-ing perfect
could I have been hacking? could you have been hacking? could he have been hacking? could we have been hacking? could you have been hacking? could they have been hacking?
Interro-negative form
Simple form
could I not hack? could you not hack? could he not hack? could we not hack? could you not hack? could they not hack?
V-ing form
could I not be hacking? could you not be hacking? could he not be hacking? could we not be hacking? could you not be hacking? could they not be hacking?
Perfect
could I not have hacked? could you not have hacked? could he not have hacked? could we not have hacked? could you not have hacked? could they not have hacked?
V-ing perfect
could I not have been hacking? could you not have been hacking? could he not have been hacking? could we not have been hacking? could you not have been hacking? could they not have been hacking?