English verb conjugation
COULD COARSEN

Regular verb: coarsen - coarsened - coarsened

Affirmation

Simple form	V-ing form
I could coarsen you could coarsen he could coarsen we could coarsen you could coarsen they could coarsen	I could be coarsening you could be coarsening he could be coarsening we could be coarsening you could be coarsening they could be coarsening
Perfect	V-ing perfect
I could have coarsened you could have coarsened he could have coarsened we could have coarsened you could have coarsened they could have coarsened	I could have been coarsening you could have been coarsening he could have been coarsening we could have been coarsening you could have been coarsening they could have been coarsening

Negation

Simple form	V-ing form
I couldn't coarsen you couldn't coarsen he couldn't coarsen we couldn't coarsen you couldn't coarsen they couldn't coarsen	I couldn't be coarsening you couldn't be coarsening he couldn't be coarsening we couldn't be coarsening you couldn't be coarsening they couldn't be coarsening
Perfect	V-ing perfect
I couldn't have coarsened you couldn't have coarsened he couldn't have coarsened we couldn't have coarsened you couldn't have coarsened they couldn't have coarsened	I couldn't have been coarsening you couldn't have been coarsening he couldn't have been coarsening we couldn't have been coarsening you couldn't have been coarsening they couldn't have been coarsening

Interrogative form

Simple form	V-ing form
could I coarsen? could you coarsen? could he coarsen? could we coarsen? could you coarsen? could they coarsen?	could I be coarsening? could you be coarsening? could he be coarsening? could we be coarsening? could you be coarsening? could they be coarsening?
Perfect	V-ing perfect
could I have coarsened? could you have coarsened? could he have coarsened? could we have coarsened? could you have coarsened? could they have coarsened?	could I have been coarsening? could you have been coarsening? could he have been coarsening? could we have been coarsening? could you have been coarsening? could they have been coarsening?

Interro-negative form

Simple form	V-ing form
couldn't I coarsen? couldn't you coarsen? couldn't he coarsen? couldn't we coarsen? couldn't you coarsen? couldn't they coarsen?	couldn't I be coarsening? couldn't you be coarsening? couldn't he be coarsening? couldn't we be coarsening? couldn't you be coarsening? couldn't they be coarsening?
Perfect	V-ing perfect
couldn't I have coarsened? couldn't you have coarsened? couldn't he have coarsened? couldn't we have coarsened? couldn't you have coarsened? couldn't they have coarsened?	couldn't I have been coarsening? couldn't you have been coarsening? couldn't he have been coarsening? couldn't we have been coarsening? couldn't you have been coarsening? couldn't they have been coarsening?