English verb conjugation
COULD OVERHARDEN

Regular verb: overharden - overhardened - overhardened

Affirmation

Simple form	V-ing form
I could overharden you could overharden he could overharden we could overharden you could overharden they could overharden	I could be overhardening you could be overhardening he could be overhardening we could be overhardening you could be overhardening they could be overhardening
Perfect	V-ing perfect
I could have overhardened you could have overhardened he could have overhardened we could have overhardened you could have overhardened they could have overhardened	I could have been overhardening you could have been overhardening he could have been overhardening we could have been overhardening you could have been overhardening they could have been overhardening

Negation

Simple form	V-ing form
I couldn't overharden you couldn't overharden he couldn't overharden we couldn't overharden you couldn't overharden they couldn't overharden	I couldn't be overhardening you couldn't be overhardening he couldn't be overhardening we couldn't be overhardening you couldn't be overhardening they couldn't be overhardening
Perfect	V-ing perfect
I couldn't have overhardened you couldn't have overhardened he couldn't have overhardened we couldn't have overhardened you couldn't have overhardened they couldn't have overhardened	I couldn't have been overhardening you couldn't have been overhardening he couldn't have been overhardening we couldn't have been overhardening you couldn't have been overhardening they couldn't have been overhardening

Interrogative form

Simple form	V-ing form
could I overharden? could you overharden? could he overharden? could we overharden? could you overharden? could they overharden?	could I be overhardening? could you be overhardening? could he be overhardening? could we be overhardening? could you be overhardening? could they be overhardening?
Perfect	V-ing perfect
could I have overhardened? could you have overhardened? could he have overhardened? could we have overhardened? could you have overhardened? could they have overhardened?	could I have been overhardening? could you have been overhardening? could he have been overhardening? could we have been overhardening? could you have been overhardening? could they have been overhardening?

Interro-negative form

Simple form	V-ing form
couldn't I overharden? couldn't you overharden? couldn't he overharden? couldn't we overharden? couldn't you overharden? couldn't they overharden?	couldn't I be overhardening? couldn't you be overhardening? couldn't he be overhardening? couldn't we be overhardening? couldn't you be overhardening? couldn't they be overhardening?
Perfect	V-ing perfect
couldn't I have overhardened? couldn't you have overhardened? couldn't he have overhardened? couldn't we have overhardened? couldn't you have overhardened? couldn't they have overhardened?	couldn't I have been overhardening? couldn't you have been overhardening? couldn't he have been overhardening? couldn't we have been overhardening? couldn't you have been overhardening? couldn't they have been overhardening?