must flummox
Regular verb: flummox - flummoxed- flummoxed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flummox
you must flummox
she must flummox
we must flummox
you must flummox
they must flummox 	I must be flummoxing
you must be flummoxing
she must be flummoxing
we must be flummoxing
you must be flummoxing
they must be flummoxing	I must have flummoxed
you must have flummoxed
she must have flummoxed
we must have flummoxed
you must have flummoxed
they must have flummoxed	I must have been flummoxing
you must have been flummoxing
she must have been flummoxing
we must have been flummoxing
you must have been flummoxing
they must have been flummoxing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't flummox
you mustn't flummox
she mustn't flummox
we mustn't flummox
you mustn't flummox
they mustn't flummox 	I mustn't be flummoxing
you mustn't be flummoxing
she mustn't be flummoxing
we mustn't be flummoxing
you mustn't be flummoxing
they mustn't be flummoxing	I mustn't have flummoxed
you mustn't have flummoxed
she mustn't have flummoxed
we mustn't have flummoxed
you mustn't have flummoxed
they mustn't have flummoxed	I mustn't have been flummoxing
you mustn't have been flummoxing
she mustn't have been flummoxing
we mustn't have been flummoxing
you mustn't have been flummoxing
they mustn't have been flummoxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flummox?
must you flummox?
must she flummox?
must we flummox?
must you flummox?
must they flummox? 	must I be flummoxing?
must you be flummoxing?
must she be flummoxing?
must we be flummoxing?
must you be flummoxing?
must they be flummoxing? 	must I have flummoxed?
must you have flummoxed?
must she have flummoxed?
must we have flummoxed?
must you have flummoxed?
must they have flummoxed? 	must I have been flummoxing?
must you have been flummoxing?
must she have been flummoxing?
must we have been flummoxing?
must you have been flummoxing?
must they have been flummoxing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I flummox?
mustn't you flummox?
mustn't she flummox?
mustn't we flummox?
mustn't you flummox?
mustn't they flummox? 	mustn't I be flummoxing?
mustn't you be flummoxing?
mustn't she be flummoxing?
mustn't we be flummoxing?
mustn't you be flummoxing?
mustn't they be flummoxing? 	mustn't I have flummoxed?
mustn't you have flummoxed?
mustn't she have flummoxed?
mustn't we have flummoxed?
mustn't you have flummoxed?
mustn't they have flummoxed? 	mustn't I have been flummoxing?
mustn't you have been flummoxing?
mustn't she have been flummoxing?
mustn't we have been flummoxing?
mustn't you have been flummoxing?
mustn't they have been flummoxing?