can dumbfound
Regular verb: dumbfound - dumbfounded- dumbfounded

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

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

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

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