I must comfort you must comfort he must comfort we must comfort you must comfort they must comfort
V-ing form
I must be comforting you must be comforting he must be comforting we must be comforting you must be comforting they must be comforting
Perfect
I must have comforted you must have comforted he must have comforted we must have comforted you must have comforted they must have comforted
V-ing perfect
I must have been comforting you must have been comforting he must have been comforting we must have been comforting you must have been comforting they must have been comforting
Negation
Simple form
I mustn't comfort you mustn't comfort he mustn't comfort we mustn't comfort you mustn't comfort they mustn't comfort
V-ing form
I mustn't be comforting you mustn't be comforting he mustn't be comforting we mustn't be comforting you mustn't be comforting they mustn't be comforting
Perfect
I mustn't have comforted you mustn't have comforted he mustn't have comforted we mustn't have comforted you mustn't have comforted they mustn't have comforted
V-ing perfect
I mustn't have been comforting you mustn't have been comforting he mustn't have been comforting we mustn't have been comforting you mustn't have been comforting they mustn't have been comforting
Interrogative form
Simple form
must I comfort? must you comfort? must he comfort? must we comfort? must you comfort? must they comfort?
V-ing form
must I be comforting? must you be comforting? must he be comforting? must we be comforting? must you be comforting? must they be comforting?
Perfect
must I have comforted? must you have comforted? must he have comforted? must we have comforted? must you have comforted? must they have comforted?
V-ing perfect
must I have been comforting? must you have been comforting? must he have been comforting? must we have been comforting? must you have been comforting? must they have been comforting?
Interro-negative form
Simple form
mustn't I comfort? mustn't you comfort? mustn't he comfort? mustn't we comfort? mustn't you comfort? mustn't they comfort?
V-ing form
mustn't I be comforting? mustn't you be comforting? mustn't he be comforting? mustn't we be comforting? mustn't you be comforting? mustn't they be comforting?
Perfect
mustn't I have comforted? mustn't you have comforted? mustn't he have comforted? mustn't we have comforted? mustn't you have comforted? mustn't they have comforted?
V-ing perfect
mustn't I have been comforting? mustn't you have been comforting? mustn't he have been comforting? mustn't we have been comforting? mustn't you have been comforting? mustn't they have been comforting?