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 couldn't widen widen you couldn't widen widen he couldn't widen widen we couldn't widen widen you couldn't widen widen they couldn't widen widen
V-ing form
I couldn't be widen widening you couldn't be widen widening he couldn't be widen widening we couldn't be widen widening you couldn't be widen widening they couldn't be widen widening
Perfect
I couldn't have widen widened you couldn't have widen widened he couldn't have widen widened we couldn't have widen widened you couldn't have widen widened they couldn't have widen widened
V-ing perfect
I couldn't have been widen widening you couldn't have been widen widening he couldn't have been widen widening we couldn't have been widen widening you couldn't have been widen widening they couldn't 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
couldn't I widen widen? couldn't you widen widen? couldn't he widen widen? couldn't we widen widen? couldn't you widen widen? couldn't they widen widen?
V-ing form
couldn't I be widen widening? couldn't you be widen widening? couldn't he be widen widening? couldn't we be widen widening? couldn't you be widen widening? couldn't they be widen widening?
Perfect
couldn't I have widen widened? couldn't you have widen widened? couldn't he have widen widened? couldn't we have widen widened? couldn't you have widen widened? couldn't they have widen widened?
V-ing perfect
couldn't I have been widen widening? couldn't you have been widen widening? couldn't he have been widen widening? couldn't we have been widen widening? couldn't you have been widen widening? couldn't they have been widen widening?