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