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