must stymy
Regular verb: stymy - stymied- stymied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stymy
you must stymy
he must stymy
we must stymy
you must stymy
they must stymy 	I must be stymying
you must be stymying
he must be stymying
we must be stymying
you must be stymying
they must be stymying	I must have stymied
you must have stymied
he must have stymied
we must have stymied
you must have stymied
they must have stymied	I must have been stymying
you must have been stymying
he must have been stymying
we must have been stymying
you must have been stymying
they must have been stymying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't stymy
you mustn't stymy
he mustn't stymy
we mustn't stymy
you mustn't stymy
they mustn't stymy 	I mustn't be stymying
you mustn't be stymying
he mustn't be stymying
we mustn't be stymying
you mustn't be stymying
they mustn't be stymying	I mustn't have stymied
you mustn't have stymied
he mustn't have stymied
we mustn't have stymied
you mustn't have stymied
they mustn't have stymied	I mustn't have been stymying
you mustn't have been stymying
he mustn't have been stymying
we mustn't have been stymying
you mustn't have been stymying
they mustn't have been stymying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stymy?
must you stymy?
must he stymy?
must we stymy?
must you stymy?
must they stymy? 	must I be stymying?
must you be stymying?
must he be stymying?
must we be stymying?
must you be stymying?
must they be stymying? 	must I have stymied?
must you have stymied?
must he have stymied?
must we have stymied?
must you have stymied?
must they have stymied? 	must I have been stymying?
must you have been stymying?
must he have been stymying?
must we have been stymying?
must you have been stymying?
must they have been stymying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I stymy?
mustn't you stymy?
mustn't he stymy?
mustn't we stymy?
mustn't you stymy?
mustn't they stymy? 	mustn't I be stymying?
mustn't you be stymying?
mustn't he be stymying?
mustn't we be stymying?
mustn't you be stymying?
mustn't they be stymying? 	mustn't I have stymied?
mustn't you have stymied?
mustn't he have stymied?
mustn't we have stymied?
mustn't you have stymied?
mustn't they have stymied? 	mustn't I have been stymying?
mustn't you have been stymying?
mustn't he have been stymying?
mustn't we have been stymying?
mustn't you have been stymying?
mustn't they have been stymying?