English verb conjugation
COULD DUPE

Regular verb: dupe - duped - duped

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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