shall dumbfound
Regular verb: dumbfound - dumbfounded- dumbfounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'll dumbfound
you'll dumbfound
she'll dumbfound
we'll dumbfound
you'll dumbfound
they'll dumbfound 	I'll be dumbfounding
you'll be dumbfounding
she'll be dumbfounding
we'll be dumbfounding
you'll be dumbfounding
they'll be dumbfounding	I'll have dumbfounded
you'll have dumbfounded
she'll have dumbfounded
we'll have dumbfounded
you'll have dumbfounded
they'll have dumbfounded	I'll have been dumbfounding
you'll have been dumbfounding
she'll have been dumbfounding
we'll have been dumbfounding
you'll have been dumbfounding
they'll have been dumbfounding	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shall I dumbfound?
shall you dumbfound?
shall she dumbfound?
shall we dumbfound?
shall you dumbfound?
shall they dumbfound? 	shall I be dumbfounding?
shall you be dumbfounding?
shall she be dumbfounding?
shall we be dumbfounding?
shall you be dumbfounding?
shall they be dumbfounding? 	shall I have dumbfounded?
shall you have dumbfounded?
shall she have dumbfounded?
shall we have dumbfounded?
shall you have dumbfounded?
shall they have dumbfounded? 	shall I have been dumbfounding?
shall you have been dumbfounding?
shall she have been dumbfounding?
shall we have been dumbfounding?
shall you have been dumbfounding?
shall they have been dumbfounding? 	

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