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