I must devour you must devour she must devour we must devour you must devour they must devour
V-ing form
I must be devouring you must be devouring she must be devouring we must be devouring you must be devouring they must be devouring
Perfect
I must have devoured you must have devoured she 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 she 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 she 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 she 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 she 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 she 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 she devour? must we devour? must you devour? must they devour?
V-ing form
must I be devouring? must you be devouring? must she be devouring? must we be devouring? must you be devouring? must they be devouring?
Perfect
must I have devoured? must you have devoured? must she 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 she 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 she 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 she 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 she 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 she have been devouring? mustn't we have been devouring? mustn't you have been devouring? mustn't they have been devouring?