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