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