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