English verb conjugation
COULD OVERHARDEN

Regular verb: overharden - overhardened - overhardened

Affirmation

Simple form	V-ing form
I could overharden you could overharden she could overharden we could overharden you could overharden they could overharden	I could be overhardening you could be overhardening she 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 she 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 she 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 she 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 she 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 she 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 she 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 she overharden? could we overharden? could you overharden? could they overharden?	could I be overhardening? could you be overhardening? could she 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 she 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 she 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 she 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 she 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 she 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 she not have been overhardening? could we not have been overhardening? could you not have been overhardening? could they not have been overhardening?