ought to dumbfound
Regular verb: dumbfound - dumbfounded- dumbfounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to dumbfound
you ought to dumbfound
he ought to dumbfound
we ought to dumbfound
you ought to dumbfound
they ought to dumbfound 	I ought to be dumbfounding
you ought to be dumbfounding
he ought to be dumbfounding
we ought to be dumbfounding
you ought to be dumbfounding
they ought to be dumbfounding	I ought to have dumbfounded
you ought to have dumbfounded
he ought to have dumbfounded
we ought to have dumbfounded
you ought to have dumbfounded
they ought to have dumbfounded	I ought to have been dumbfounding
you ought to have been dumbfounding
he ought to have been dumbfounding
we ought to have been dumbfounding
you ought to have been dumbfounding
they ought to have been dumbfounding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to dumbfound
you oughtn't to dumbfound
he oughtn't to dumbfound
we oughtn't to dumbfound
you oughtn't to dumbfound
they oughtn't to dumbfound 	I oughtn't to be dumbfounding
you oughtn't to be dumbfounding
he oughtn't to be dumbfounding
we oughtn't to be dumbfounding
you oughtn't to be dumbfounding
they oughtn't to be dumbfounding	I oughtn't to have dumbfounded
you oughtn't to have dumbfounded
he oughtn't to have dumbfounded
we oughtn't to have dumbfounded
you oughtn't to have dumbfounded
they oughtn't to have dumbfounded	I oughtn't to have been dumbfounding
you oughtn't to have been dumbfounding
he oughtn't to have been dumbfounding
we oughtn't to have been dumbfounding
you oughtn't to have been dumbfounding
they oughtn't to have been dumbfounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I dumbfound?
ought to you dumbfound?
ought to he dumbfound?
ought to we dumbfound?
ought to you dumbfound?
ought to they dumbfound? 	ought to I be dumbfounding?
ought to you be dumbfounding?
ought to he be dumbfounding?
ought to we be dumbfounding?
ought to you be dumbfounding?
ought to they be dumbfounding? 	ought to I have dumbfounded?
ought to you have dumbfounded?
ought to he have dumbfounded?
ought to we have dumbfounded?
ought to you have dumbfounded?
ought to they have dumbfounded? 	ought to I have been dumbfounding?
ought to you have been dumbfounding?
ought to he have been dumbfounding?
ought to we have been dumbfounding?
ought to you have been dumbfounding?
ought to they have been dumbfounding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to dumbfound?
oughtn't you to dumbfound?
oughtn't he to dumbfound?
oughtn't we to dumbfound?
oughtn't you to dumbfound?
oughtn't they to dumbfound? 	oughtn't I to be dumbfounding?
oughtn't you to be dumbfounding?
oughtn't he to be dumbfounding?
oughtn't we to be dumbfounding?
oughtn't you to be dumbfounding?
oughtn't they to be dumbfounding? 	oughtn't I to have dumbfounded?
oughtn't you to have dumbfounded?
oughtn't he to have dumbfounded?
oughtn't we to have dumbfounded?
oughtn't you to have dumbfounded?
oughtn't they to have dumbfounded? 	oughtn't I to have been dumbfounding?
oughtn't you to have been dumbfounding?
oughtn't he to have been dumbfounding?
oughtn't we to have been dumbfounding?
oughtn't you to have been dumbfounding?
oughtn't they to have been dumbfounding?