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 could not overharden you could not overharden he could not overharden we could not overharden you could not overharden they could not overharden	I could not be overhardening you could not be overhardening he could not be overhardening we could not be overhardening you could not be overhardening they could not be overhardening
Perfect	V-ing perfect
I could not have overhardened you could not have overhardened he could not have overhardened we could not have overhardened you could not have overhardened they could not have overhardened	I could not have been overhardening you could not have been overhardening he could not have been overhardening we could not have been overhardening you could not have been overhardening they could not 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
could I not overharden? could you not overharden? could he not overharden? could we not overharden? could you not overharden? could they not overharden?	could I not be overhardening? could you not be overhardening? could he not be overhardening? could we not be overhardening? could you not be overhardening? could they not be overhardening?
Perfect	V-ing perfect
could I not have overhardened? could you not have overhardened? could he not have overhardened? could we not have overhardened? could you not have overhardened? could they not have overhardened?	could I not have been overhardening? could you not have been overhardening? could he not have been overhardening? could we not have been overhardening? could you not have been overhardening? could they not have been overhardening?