must retrospect
Regular verb: retrospect - retrospected- retrospected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I must not retrospect
you must not retrospect
he must not retrospect
we must not retrospect
you must not retrospect
they must not retrospect 	I must not be retrospecting
you must not be retrospecting
he must not be retrospecting
we must not be retrospecting
you must not be retrospecting
they must not be retrospecting	I must not have retrospected
you must not have retrospected
he must not have retrospected
we must not have retrospected
you must not have retrospected
they must not have retrospected	I must not have been retrospecting
you must not have been retrospecting
he must not have been retrospecting
we must not have been retrospecting
you must not have been retrospecting
they must not have been retrospecting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
must I not retrospect?
must you not retrospect?
must he not retrospect?
must we not retrospect?
must you not retrospect?
must they not retrospect? 	must I not be retrospecting?
must you not be retrospecting?
must he not be retrospecting?
must we not be retrospecting?
must you not be retrospecting?
must they not be retrospecting? 	must I not have retrospected?
must you not have retrospected?
must he not have retrospected?
must we not have retrospected?
must you not have retrospected?
must they not have retrospected? 	must I not have been retrospecting?
must you not have been retrospecting?
must he not have been retrospecting?
must we not have been retrospecting?
must you not have been retrospecting?
must they not have been retrospecting?