could dupe
Regular verb: dupe - duped- duped

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

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