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 can't keypunch you can't keypunch he can't keypunch we can't keypunch you can't keypunch they can't keypunch
V-ing form
I can't be keypunching you can't be keypunching he can't be keypunching we can't be keypunching you can't be keypunching they can't be keypunching
Perfect
I can't have keypunched you can't have keypunched he can't have keypunched we can't have keypunched you can't have keypunched they can't have keypunched
V-ing perfect
I can't have been keypunching you can't have been keypunching he can't have been keypunching we can't have been keypunching you can't have been keypunching they can't 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't I keypunch? can't you keypunch? can't he keypunch? can't we keypunch? can't you keypunch? can't they keypunch?
V-ing form
can't I be keypunching? can't you be keypunching? can't he be keypunching? can't we be keypunching? can't you be keypunching? can't they be keypunching?
Perfect
can't I have keypunched? can't you have keypunched? can't he have keypunched? can't we have keypunched? can't you have keypunched? can't they have keypunched?
V-ing perfect
can't I have been keypunching? can't you have been keypunching? can't he have been keypunching? can't we have been keypunching? can't you have been keypunching? can't they have been keypunching?