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