Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could widen widen you could widen widen he could widen widen we could widen widen you could widen widen they could widen widen
V-ing form
I could be widen widening you could be widen widening he could be widen widening we could be widen widening you could be widen widening they could be widen widening
Perfect
I could have widen widened you could have widen widened he could have widen widened we could have widen widened you could have widen widened they could have widen widened
V-ing perfect
I could have been widen widening you could have been widen widening he could have been widen widening we could have been widen widening you could have been widen widening they could have been widen widening
Negation
Simple form
I could not widen widen you could not widen widen he could not widen widen we could not widen widen you could not widen widen they could not widen widen
V-ing form
I could not be widen widening you could not be widen widening he could not be widen widening we could not be widen widening you could not be widen widening they could not be widen widening
Perfect
I could not have widen widened you could not have widen widened he could not have widen widened we could not have widen widened you could not have widen widened they could not have widen widened
V-ing perfect
I could not have been widen widening you could not have been widen widening he could not have been widen widening we could not have been widen widening you could not have been widen widening they could not have been widen widening
Interrogative form
Simple form
could I widen widen? could you widen widen? could he widen widen? could we widen widen? could you widen widen? could they widen widen?
V-ing form
could I be widen widening? could you be widen widening? could he be widen widening? could we be widen widening? could you be widen widening? could they be widen widening?
Perfect
could I have widen widened? could you have widen widened? could he have widen widened? could we have widen widened? could you have widen widened? could they have widen widened?
V-ing perfect
could I have been widen widening? could you have been widen widening? could he have been widen widening? could we have been widen widening? could you have been widen widening? could they have been widen widening?
Interro-negative form
Simple form
could I not widen widen? could you not widen widen? could he not widen widen? could we not widen widen? could you not widen widen? could they not widen widen?
V-ing form
could I not be widen widening? could you not be widen widening? could he not be widen widening? could we not be widen widening? could you not be widen widening? could they not be widen widening?
Perfect
could I not have widen widened? could you not have widen widened? could he not have widen widened? could we not have widen widened? could you not have widen widened? could they not have widen widened?
V-ing perfect
could I not have been widen widening? could you not have been widen widening? could he not have been widen widening? could we not have been widen widening? could you not have been widen widening? could they not have been widen widening?