English verb conjugation
MUST OBSOLESCE

Regular verb: obsolesce - obsolesced - obsolesced

Affirmation

Simple form	V-ing form
I must obsolesce you must obsolesce she must obsolesce we must obsolesce you must obsolesce they must obsolesce	I must be obsolescing you must be obsolescing she must be obsolescing we must be obsolescing you must be obsolescing they must be obsolescing
Perfect	V-ing perfect
I must have obsolesced you must have obsolesced she must have obsolesced we must have obsolesced you must have obsolesced they must have obsolesced	I must have been obsolescing you must have been obsolescing she must have been obsolescing we must have been obsolescing you must have been obsolescing they must have been obsolescing

Negation

Simple form	V-ing form
I mustn't obsolesce you mustn't obsolesce she mustn't obsolesce we mustn't obsolesce you mustn't obsolesce they mustn't obsolesce	I mustn't be obsolescing you mustn't be obsolescing she mustn't be obsolescing we mustn't be obsolescing you mustn't be obsolescing they mustn't be obsolescing
Perfect	V-ing perfect
I mustn't have obsolesced you mustn't have obsolesced she mustn't have obsolesced we mustn't have obsolesced you mustn't have obsolesced they mustn't have obsolesced	I mustn't have been obsolescing you mustn't have been obsolescing she mustn't have been obsolescing we mustn't have been obsolescing you mustn't have been obsolescing they mustn't have been obsolescing

Interrogative form

Simple form	V-ing form
must I obsolesce? must you obsolesce? must she obsolesce? must we obsolesce? must you obsolesce? must they obsolesce?	must I be obsolescing? must you be obsolescing? must she be obsolescing? must we be obsolescing? must you be obsolescing? must they be obsolescing?
Perfect	V-ing perfect
must I have obsolesced? must you have obsolesced? must she have obsolesced? must we have obsolesced? must you have obsolesced? must they have obsolesced?	must I have been obsolescing? must you have been obsolescing? must she have been obsolescing? must we have been obsolescing? must you have been obsolescing? must they have been obsolescing?

Interro-negative form

Simple form	V-ing form
mustn't I obsolesce? mustn't you obsolesce? mustn't she obsolesce? mustn't we obsolesce? mustn't you obsolesce? mustn't they obsolesce?	mustn't I be obsolescing? mustn't you be obsolescing? mustn't she be obsolescing? mustn't we be obsolescing? mustn't you be obsolescing? mustn't they be obsolescing?
Perfect	V-ing perfect
mustn't I have obsolesced? mustn't you have obsolesced? mustn't she have obsolesced? mustn't we have obsolesced? mustn't you have obsolesced? mustn't they have obsolesced?	mustn't I have been obsolescing? mustn't you have been obsolescing? mustn't she have been obsolescing? mustn't we have been obsolescing? mustn't you have been obsolescing? mustn't they have been obsolescing?