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