could debrief
Regular verb: debrief - debriefed- debriefed

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

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

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

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