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