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