must debrief
Regular verb: debrief - debriefed- debriefed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must debrief
you must debrief
he must debrief
we must debrief
you must debrief
they must debrief 	I must be debriefing
you must be debriefing
he must be debriefing
we must be debriefing
you must be debriefing
they must be debriefing	I must have debriefed
you must have debriefed
he must have debriefed
we must have debriefed
you must have debriefed
they must have debriefed	I must have been debriefing
you must have been debriefing
he must have been debriefing
we must have been debriefing
you must have been debriefing
they must have been debriefing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not debrief
you must not debrief
he must not debrief
we must not debrief
you must not debrief
they must not debrief 	I must not be debriefing
you must not be debriefing
he must not be debriefing
we must not be debriefing
you must not be debriefing
they must not be debriefing	I must not have debriefed
you must not have debriefed
he must not have debriefed
we must not have debriefed
you must not have debriefed
they must not have debriefed	I must not have been debriefing
you must not have been debriefing
he must not have been debriefing
we must not have been debriefing
you must not have been debriefing
they must not have been debriefing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I debrief?
must you debrief?
must he debrief?
must we debrief?
must you debrief?
must they debrief? 	must I be debriefing?
must you be debriefing?
must he be debriefing?
must we be debriefing?
must you be debriefing?
must they be debriefing? 	must I have debriefed?
must you have debriefed?
must he have debriefed?
must we have debriefed?
must you have debriefed?
must they have debriefed? 	must I have been debriefing?
must you have been debriefing?
must he have been debriefing?
must we have been debriefing?
must you have been debriefing?
must they have been debriefing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not debrief?
must you not debrief?
must he not debrief?
must we not debrief?
must you not debrief?
must they not debrief? 	must I not be debriefing?
must you not be debriefing?
must he not be debriefing?
must we not be debriefing?
must you not be debriefing?
must they not be debriefing? 	must I not have debriefed?
must you not have debriefed?
must he not have debriefed?
must we not have debriefed?
must you not have debriefed?
must they not have debriefed? 	must I not have been debriefing?
must you not have been debriefing?
must he not have been debriefing?
must we not have been debriefing?
must you not have been debriefing?
must they not have been debriefing?