I could cheat you could cheat he could cheat we could cheat you could cheat they could cheat
V-ing form
I could be cheating you could be cheating he could be cheating we could be cheating you could be cheating they could be cheating
Perfect
I could have cheated you could have cheated he could have cheated we could have cheated you could have cheated they could have cheated
V-ing perfect
I could have been cheating you could have been cheating he could have been cheating we could have been cheating you could have been cheating they could have been cheating
Negation
Simple form
I could not cheat you could not cheat he could not cheat we could not cheat you could not cheat they could not cheat
V-ing form
I could not be cheating you could not be cheating he could not be cheating we could not be cheating you could not be cheating they could not be cheating
Perfect
I could not have cheated you could not have cheated he could not have cheated we could not have cheated you could not have cheated they could not have cheated
V-ing perfect
I could not have been cheating you could not have been cheating he could not have been cheating we could not have been cheating you could not have been cheating they could not have been cheating
Interrogative form
Simple form
could I cheat? could you cheat? could he cheat? could we cheat? could you cheat? could they cheat?
V-ing form
could I be cheating? could you be cheating? could he be cheating? could we be cheating? could you be cheating? could they be cheating?
Perfect
could I have cheated? could you have cheated? could he have cheated? could we have cheated? could you have cheated? could they have cheated?
V-ing perfect
could I have been cheating? could you have been cheating? could he have been cheating? could we have been cheating? could you have been cheating? could they have been cheating?
Interro-negative form
Simple form
could I not cheat? could you not cheat? could he not cheat? could we not cheat? could you not cheat? could they not cheat?
V-ing form
could I not be cheating? could you not be cheating? could he not be cheating? could we not be cheating? could you not be cheating? could they not be cheating?
Perfect
could I not have cheated? could you not have cheated? could he not have cheated? could we not have cheated? could you not have cheated? could they not have cheated?
V-ing perfect
could I not have been cheating? could you not have been cheating? could he not have been cheating? could we not have been cheating? could you not have been cheating? could they not have been cheating?