must dupe
Regular verb: dupe - duped- duped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must dupe
you must dupe
she must dupe
we must dupe
you must dupe
they must dupe 	I must be duping
you must be duping
she must be duping
we must be duping
you must be duping
they must be duping	I must have duped
you must have duped
she 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
she 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 must not dupe
you must not dupe
she must not dupe
we must not dupe
you must not dupe
they must not dupe 	I must not be duping
you must not be duping
she must not be duping
we must not be duping
you must not be duping
they must not be duping	I must not have duped
you must not have duped
she must not have duped
we must not have duped
you must not have duped
they must not have duped	I must not have been duping
you must not have been duping
she must not have been duping
we must not have been duping
you must not have been duping
they must not have been duping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I dupe?
must you dupe?
must she dupe?
must we dupe?
must you dupe?
must they dupe? 	must I be duping?
must you be duping?
must she be duping?
must we be duping?
must you be duping?
must they be duping? 	must I have duped?
must you have duped?
must she 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 she 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 	
must I not dupe?
must you not dupe?
must she not dupe?
must we not dupe?
must you not dupe?
must they not dupe? 	must I not be duping?
must you not be duping?
must she not be duping?
must we not be duping?
must you not be duping?
must they not be duping? 	must I not have duped?
must you not have duped?
must she not have duped?
must we not have duped?
must you not have duped?
must they not have duped? 	must I not have been duping?
must you not have been duping?
must she not have been duping?
must we not have been duping?
must you not have been duping?
must they not have been duping?