English verb conjugation
MUST WORSEN

Regular verb: worsen - worsened - worsened

Affirmation

Simple form	V-ing form
I must worsen you must worsen he must worsen we must worsen you must worsen they must worsen	I must be worsening you must be worsening he must be worsening we must be worsening you must be worsening they must be worsening
Perfect	V-ing perfect
I must have worsened you must have worsened he must have worsened we must have worsened you must have worsened they must have worsened	I must have been worsening you must have been worsening he must have been worsening we must have been worsening you must have been worsening they must have been worsening

Negation

Simple form	V-ing form
I mustn't worsen you mustn't worsen he mustn't worsen we mustn't worsen you mustn't worsen they mustn't worsen	I mustn't be worsening you mustn't be worsening he mustn't be worsening we mustn't be worsening you mustn't be worsening they mustn't be worsening
Perfect	V-ing perfect
I mustn't have worsened you mustn't have worsened he mustn't have worsened we mustn't have worsened you mustn't have worsened they mustn't have worsened	I mustn't have been worsening you mustn't have been worsening he mustn't have been worsening we mustn't have been worsening you mustn't have been worsening they mustn't have been worsening

Interrogative form

Simple form	V-ing form
must I worsen? must you worsen? must he worsen? must we worsen? must you worsen? must they worsen?	must I be worsening? must you be worsening? must he be worsening? must we be worsening? must you be worsening? must they be worsening?
Perfect	V-ing perfect
must I have worsened? must you have worsened? must he have worsened? must we have worsened? must you have worsened? must they have worsened?	must I have been worsening? must you have been worsening? must he have been worsening? must we have been worsening? must you have been worsening? must they have been worsening?

Interro-negative form

Simple form	V-ing form
mustn't I worsen? mustn't you worsen? mustn't he worsen? mustn't we worsen? mustn't you worsen? mustn't they worsen?	mustn't I be worsening? mustn't you be worsening? mustn't he be worsening? mustn't we be worsening? mustn't you be worsening? mustn't they be worsening?
Perfect	V-ing perfect
mustn't I have worsened? mustn't you have worsened? mustn't he have worsened? mustn't we have worsened? mustn't you have worsened? mustn't they have worsened?	mustn't I have been worsening? mustn't you have been worsening? mustn't he have been worsening? mustn't we have been worsening? mustn't you have been worsening? mustn't they have been worsening?