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