English verb conjugation
COULD KEYPUNCH

Regular verb: keypunch - keypunched - keypunched

Affirmation

Simple form	V-ing form
I could keypunch you could keypunch he could keypunch we could keypunch you could keypunch they could keypunch	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	V-ing 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	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	V-ing form
I couldn't keypunch you couldn't keypunch he couldn't keypunch we couldn't keypunch you couldn't keypunch they couldn't keypunch	I couldn't be keypunching you couldn't be keypunching he couldn't be keypunching we couldn't be keypunching you couldn't be keypunching they couldn't be keypunching
Perfect	V-ing perfect
I couldn't have keypunched you couldn't have keypunched he couldn't have keypunched we couldn't have keypunched you couldn't have keypunched they couldn't have keypunched	I couldn't have been keypunching you couldn't have been keypunching he couldn't have been keypunching we couldn't have been keypunching you couldn't have been keypunching they couldn't have been keypunching

Interrogative form

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