English verb conjugation
COULD PLUMPEN

Regular verb: plumpen - plumpened - plumpened

Affirmation

Simple form	V-ing form
I could plumpen you could plumpen he could plumpen we could plumpen you could plumpen they could plumpen	I could be plumpening you could be plumpening he could be plumpening we could be plumpening you could be plumpening they could be plumpening
Perfect	V-ing perfect
I could have plumpened you could have plumpened he could have plumpened we could have plumpened you could have plumpened they could have plumpened	I could have been plumpening you could have been plumpening he could have been plumpening we could have been plumpening you could have been plumpening they could have been plumpening

Negation

Simple form	V-ing form
I could not plumpen you could not plumpen he could not plumpen we could not plumpen you could not plumpen they could not plumpen	I could not be plumpening you could not be plumpening he could not be plumpening we could not be plumpening you could not be plumpening they could not be plumpening
Perfect	V-ing perfect
I could not have plumpened you could not have plumpened he could not have plumpened we could not have plumpened you could not have plumpened they could not have plumpened	I could not have been plumpening you could not have been plumpening he could not have been plumpening we could not have been plumpening you could not have been plumpening they could not have been plumpening

Interrogative form

Simple form	V-ing form
could I plumpen? could you plumpen? could he plumpen? could we plumpen? could you plumpen? could they plumpen?	could I be plumpening? could you be plumpening? could he be plumpening? could we be plumpening? could you be plumpening? could they be plumpening?
Perfect	V-ing perfect
could I have plumpened? could you have plumpened? could he have plumpened? could we have plumpened? could you have plumpened? could they have plumpened?	could I have been plumpening? could you have been plumpening? could he have been plumpening? could we have been plumpening? could you have been plumpening? could they have been plumpening?

Interro-negative form

Simple form	V-ing form
could I not plumpen? could you not plumpen? could he not plumpen? could we not plumpen? could you not plumpen? could they not plumpen?	could I not be plumpening? could you not be plumpening? could he not be plumpening? could we not be plumpening? could you not be plumpening? could they not be plumpening?
Perfect	V-ing perfect
could I not have plumpened? could you not have plumpened? could he not have plumpened? could we not have plumpened? could you not have plumpened? could they not have plumpened?	could I not have been plumpening? could you not have been plumpening? could he not have been plumpening? could we not have been plumpening? could you not have been plumpening? could they not have been plumpening?