I must demoralise you must demoralise she must demoralise we must demoralise you must demoralise they must demoralise
V-ing form
I must be demoralising you must be demoralising she must be demoralising we must be demoralising you must be demoralising they must be demoralising
Perfect
I must have demoralised you must have demoralised she must have demoralised we must have demoralised you must have demoralised they must have demoralised
V-ing perfect
I must have been demoralising you must have been demoralising she must have been demoralising we must have been demoralising you must have been demoralising they must have been demoralising
Negation
Simple form
I mustn't demoralise you mustn't demoralise she mustn't demoralise we mustn't demoralise you mustn't demoralise they mustn't demoralise
V-ing form
I mustn't be demoralising you mustn't be demoralising she mustn't be demoralising we mustn't be demoralising you mustn't be demoralising they mustn't be demoralising
Perfect
I mustn't have demoralised you mustn't have demoralised she mustn't have demoralised we mustn't have demoralised you mustn't have demoralised they mustn't have demoralised
V-ing perfect
I mustn't have been demoralising you mustn't have been demoralising she mustn't have been demoralising we mustn't have been demoralising you mustn't have been demoralising they mustn't have been demoralising
Interrogative form
Simple form
must I demoralise? must you demoralise? must she demoralise? must we demoralise? must you demoralise? must they demoralise?
V-ing form
must I be demoralising? must you be demoralising? must she be demoralising? must we be demoralising? must you be demoralising? must they be demoralising?
Perfect
must I have demoralised? must you have demoralised? must she have demoralised? must we have demoralised? must you have demoralised? must they have demoralised?
V-ing perfect
must I have been demoralising? must you have been demoralising? must she have been demoralising? must we have been demoralising? must you have been demoralising? must they have been demoralising?
Interro-negative form
Simple form
mustn't I demoralise? mustn't you demoralise? mustn't she demoralise? mustn't we demoralise? mustn't you demoralise? mustn't they demoralise?
V-ing form
mustn't I be demoralising? mustn't you be demoralising? mustn't she be demoralising? mustn't we be demoralising? mustn't you be demoralising? mustn't they be demoralising?
Perfect
mustn't I have demoralised? mustn't you have demoralised? mustn't she have demoralised? mustn't we have demoralised? mustn't you have demoralised? mustn't they have demoralised?
V-ing perfect
mustn't I have been demoralising? mustn't you have been demoralising? mustn't she have been demoralising? mustn't we have been demoralising? mustn't you have been demoralising? mustn't they have been demoralising?