English verb conjugation
MUST DUPE

Regular verb: dupe - duped - duped

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?