English verb conjugation
MUST RETROSPECT

Regular verb: retrospect - retrospected - retrospected

Affirmation

Simple form	V-ing form
I must retrospect you must retrospect he must retrospect we must retrospect you must retrospect they must retrospect	I must be retrospecting you must be retrospecting he must be retrospecting we must be retrospecting you must be retrospecting they must be retrospecting
Perfect	V-ing perfect
I must have retrospected you must have retrospected he must have retrospected we must have retrospected you must have retrospected they must have retrospected	I must have been retrospecting you must have been retrospecting he must have been retrospecting we must have been retrospecting you must have been retrospecting they must have been retrospecting

Negation

Simple form	V-ing form
I mustn't retrospect you mustn't retrospect he mustn't retrospect we mustn't retrospect you mustn't retrospect they mustn't retrospect	I mustn't be retrospecting you mustn't be retrospecting he mustn't be retrospecting we mustn't be retrospecting you mustn't be retrospecting they mustn't be retrospecting
Perfect	V-ing perfect
I mustn't have retrospected you mustn't have retrospected he mustn't have retrospected we mustn't have retrospected you mustn't have retrospected they mustn't have retrospected	I mustn't have been retrospecting you mustn't have been retrospecting he mustn't have been retrospecting we mustn't have been retrospecting you mustn't have been retrospecting they mustn't have been retrospecting

Interrogative form

Simple form	V-ing form
must I retrospect? must you retrospect? must he retrospect? must we retrospect? must you retrospect? must they retrospect?	must I be retrospecting? must you be retrospecting? must he be retrospecting? must we be retrospecting? must you be retrospecting? must they be retrospecting?
Perfect	V-ing perfect
must I have retrospected? must you have retrospected? must he have retrospected? must we have retrospected? must you have retrospected? must they have retrospected?	must I have been retrospecting? must you have been retrospecting? must he have been retrospecting? must we have been retrospecting? must you have been retrospecting? must they have been retrospecting?

Interro-negative form

Simple form	V-ing form
mustn't I retrospect? mustn't you retrospect? mustn't he retrospect? mustn't we retrospect? mustn't you retrospect? mustn't they retrospect?	mustn't I be retrospecting? mustn't you be retrospecting? mustn't he be retrospecting? mustn't we be retrospecting? mustn't you be retrospecting? mustn't they be retrospecting?
Perfect	V-ing perfect
mustn't I have retrospected? mustn't you have retrospected? mustn't he have retrospected? mustn't we have retrospected? mustn't you have retrospected? mustn't they have retrospected?	mustn't I have been retrospecting? mustn't you have been retrospecting? mustn't he have been retrospecting? mustn't we have been retrospecting? mustn't you have been retrospecting? mustn't they have been retrospecting?