must harbinger
Regular verb: harbinger - harbingered- harbingered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must harbinger
you must harbinger
he must harbinger
we must harbinger
you must harbinger
they must harbinger 	I must be harbingering
you must be harbingering
he must be harbingering
we must be harbingering
you must be harbingering
they must be harbingering	I must have harbingered
you must have harbingered
he must have harbingered
we must have harbingered
you must have harbingered
they must have harbingered	I must have been harbingering
you must have been harbingering
he must have been harbingering
we must have been harbingering
you must have been harbingering
they must have been harbingering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't harbinger
you mustn't harbinger
he mustn't harbinger
we mustn't harbinger
you mustn't harbinger
they mustn't harbinger 	I mustn't be harbingering
you mustn't be harbingering
he mustn't be harbingering
we mustn't be harbingering
you mustn't be harbingering
they mustn't be harbingering	I mustn't have harbingered
you mustn't have harbingered
he mustn't have harbingered
we mustn't have harbingered
you mustn't have harbingered
they mustn't have harbingered	I mustn't have been harbingering
you mustn't have been harbingering
he mustn't have been harbingering
we mustn't have been harbingering
you mustn't have been harbingering
they mustn't have been harbingering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I harbinger?
must you harbinger?
must he harbinger?
must we harbinger?
must you harbinger?
must they harbinger? 	must I be harbingering?
must you be harbingering?
must he be harbingering?
must we be harbingering?
must you be harbingering?
must they be harbingering? 	must I have harbingered?
must you have harbingered?
must he have harbingered?
must we have harbingered?
must you have harbingered?
must they have harbingered? 	must I have been harbingering?
must you have been harbingering?
must he have been harbingering?
must we have been harbingering?
must you have been harbingering?
must they have been harbingering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I harbinger?
mustn't you harbinger?
mustn't he harbinger?
mustn't we harbinger?
mustn't you harbinger?
mustn't they harbinger? 	mustn't I be harbingering?
mustn't you be harbingering?
mustn't he be harbingering?
mustn't we be harbingering?
mustn't you be harbingering?
mustn't they be harbingering? 	mustn't I have harbingered?
mustn't you have harbingered?
mustn't he have harbingered?
mustn't we have harbingered?
mustn't you have harbingered?
mustn't they have harbingered? 	mustn't I have been harbingering?
mustn't you have been harbingering?
mustn't he have been harbingering?
mustn't we have been harbingering?
mustn't you have been harbingering?
mustn't they have been harbingering?