must dupe
Regular verb: dupe - duped- duped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must dupe
you must dupe
he must dupe
we must dupe
you must dupe
they must dupe 	I must be duping
you must be duping
he must be duping
we must be duping
you must be duping
they must be duping	I must have duped
you must have duped
he must have duped
we must have duped
you must have duped
they must have duped	I must have been duping
you must have been duping
he must have been duping
we must have been duping
you must have been duping
they must have been duping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't dupe
you mustn't dupe
he mustn't dupe
we mustn't dupe
you mustn't dupe
they mustn't dupe 	I mustn't be duping
you mustn't be duping
he mustn't be duping
we mustn't be duping
you mustn't be duping
they mustn't be duping	I mustn't have duped
you mustn't have duped
he mustn't have duped
we mustn't have duped
you mustn't have duped
they mustn't have duped	I mustn't have been duping
you mustn't have been duping
he mustn't have been duping
we mustn't have been duping
you mustn't have been duping
they mustn't have been duping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I dupe?
must you dupe?
must he dupe?
must we dupe?
must you dupe?
must they dupe? 	must I be duping?
must you be duping?
must he be duping?
must we be duping?
must you be duping?
must they be duping? 	must I have duped?
must you have duped?
must he have duped?
must we have duped?
must you have duped?
must they have duped? 	must I have been duping?
must you have been duping?
must he have been duping?
must we have been duping?
must you have been duping?
must they have been duping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I dupe?
mustn't you dupe?
mustn't he dupe?
mustn't we dupe?
mustn't you dupe?
mustn't they dupe? 	mustn't I be duping?
mustn't you be duping?
mustn't he be duping?
mustn't we be duping?
mustn't you be duping?
mustn't they be duping? 	mustn't I have duped?
mustn't you have duped?
mustn't he have duped?
mustn't we have duped?
mustn't you have duped?
mustn't they have duped? 	mustn't I have been duping?
mustn't you have been duping?
mustn't he have been duping?
mustn't we have been duping?
mustn't you have been duping?
mustn't they have been duping?