English verb conjugation
COULD DUMBFOUND

Regular verb: dumbfound - dumbfounded - dumbfounded

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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