I could keypunch you could keypunch he could keypunch we could keypunch you could keypunch they could keypunch
V-ing form
I could be keypunching you could be keypunching he could be keypunching we could be keypunching you could be keypunching they could be keypunching
Perfect
I could have keypunched you could have keypunched he could have keypunched we could have keypunched you could have keypunched they could have keypunched
V-ing perfect
I could have been keypunching you could have been keypunching he could have been keypunching we could have been keypunching you could have been keypunching they could have been keypunching
Negation
Simple form
I could not keypunch you could not keypunch he could not keypunch we could not keypunch you could not keypunch they could not keypunch
V-ing form
I could not be keypunching you could not be keypunching he could not be keypunching we could not be keypunching you could not be keypunching they could not be keypunching
Perfect
I could not have keypunched you could not have keypunched he could not have keypunched we could not have keypunched you could not have keypunched they could not have keypunched
V-ing perfect
I could not have been keypunching you could not have been keypunching he could not have been keypunching we could not have been keypunching you could not have been keypunching they could not have been keypunching
Interrogative form
Simple form
could I keypunch? could you keypunch? could he keypunch? could we keypunch? could you keypunch? could they keypunch?
V-ing form
could I be keypunching? could you be keypunching? could he be keypunching? could we be keypunching? could you be keypunching? could they be keypunching?
Perfect
could I have keypunched? could you have keypunched? could he have keypunched? could we have keypunched? could you have keypunched? could they have keypunched?
V-ing perfect
could I have been keypunching? could you have been keypunching? could he have been keypunching? could we have been keypunching? could you have been keypunching? could they have been keypunching?
Interro-negative form
Simple form
could I not keypunch? could you not keypunch? could he not keypunch? could we not keypunch? could you not keypunch? could they not keypunch?
V-ing form
could I not be keypunching? could you not be keypunching? could he not be keypunching? could we not be keypunching? could you not be keypunching? could they not be keypunching?
Perfect
could I not have keypunched? could you not have keypunched? could he not have keypunched? could we not have keypunched? could you not have keypunched? could they not have keypunched?
V-ing perfect
could I not have been keypunching? could you not have been keypunching? could he not have been keypunching? could we not have been keypunching? could you not have been keypunching? could they not have been keypunching?