I must worsen you must worsen she must worsen we must worsen you must worsen they must worsen
V-ing form
I must be worsening you must be worsening she must be worsening we must be worsening you must be worsening they must be worsening
Perfect
I must have worsened you must have worsened she must have worsened we must have worsened you must have worsened they must have worsened
V-ing perfect
I must have been worsening you must have been worsening she must have been worsening we must have been worsening you must have been worsening they must have been worsening
Negation
Simple form
I must not worsen you must not worsen she must not worsen we must not worsen you must not worsen they must not worsen
V-ing form
I must not be worsening you must not be worsening she must not be worsening we must not be worsening you must not be worsening they must not be worsening
Perfect
I must not have worsened you must not have worsened she must not have worsened we must not have worsened you must not have worsened they must not have worsened
V-ing perfect
I must not have been worsening you must not have been worsening she must not have been worsening we must not have been worsening you must not have been worsening they must not have been worsening
Interrogative form
Simple form
must I worsen? must you worsen? must she worsen? must we worsen? must you worsen? must they worsen?
V-ing form
must I be worsening? must you be worsening? must she be worsening? must we be worsening? must you be worsening? must they be worsening?
Perfect
must I have worsened? must you have worsened? must she have worsened? must we have worsened? must you have worsened? must they have worsened?
V-ing perfect
must I have been worsening? must you have been worsening? must she have been worsening? must we have been worsening? must you have been worsening? must they have been worsening?
Interro-negative form
Simple form
must I not worsen? must you not worsen? must she not worsen? must we not worsen? must you not worsen? must they not worsen?
V-ing form
must I not be worsening? must you not be worsening? must she not be worsening? must we not be worsening? must you not be worsening? must they not be worsening?
Perfect
must I not have worsened? must you not have worsened? must she not have worsened? must we not have worsened? must you not have worsened? must they not have worsened?
V-ing perfect
must I not have been worsening? must you not have been worsening? must she not have been worsening? must we not have been worsening? must you not have been worsening? must they not have been worsening?