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