English verb conjugation
COULD DEVOICE

Regular verb: devoice - devoiced - devoiced

Affirmation

Simple form	V-ing form
I could devoice you could devoice she could devoice we could devoice you could devoice they could devoice	I could be devoicing you could be devoicing she could be devoicing we could be devoicing you could be devoicing they could be devoicing
Perfect	V-ing perfect
I could have devoiced you could have devoiced she could have devoiced we could have devoiced you could have devoiced they could have devoiced	I could have been devoicing you could have been devoicing she could have been devoicing we could have been devoicing you could have been devoicing they could have been devoicing

Negation

Simple form	V-ing form
I couldn't devoice you couldn't devoice she couldn't devoice we couldn't devoice you couldn't devoice they couldn't devoice	I couldn't be devoicing you couldn't be devoicing she couldn't be devoicing we couldn't be devoicing you couldn't be devoicing they couldn't be devoicing
Perfect	V-ing perfect
I couldn't have devoiced you couldn't have devoiced she couldn't have devoiced we couldn't have devoiced you couldn't have devoiced they couldn't have devoiced	I couldn't have been devoicing you couldn't have been devoicing she couldn't have been devoicing we couldn't have been devoicing you couldn't have been devoicing they couldn't have been devoicing

Interrogative form

Simple form	V-ing form
could I devoice? could you devoice? could she devoice? could we devoice? could you devoice? could they devoice?	could I be devoicing? could you be devoicing? could she be devoicing? could we be devoicing? could you be devoicing? could they be devoicing?
Perfect	V-ing perfect
could I have devoiced? could you have devoiced? could she have devoiced? could we have devoiced? could you have devoiced? could they have devoiced?	could I have been devoicing? could you have been devoicing? could she have been devoicing? could we have been devoicing? could you have been devoicing? could they have been devoicing?

Interro-negative form

Simple form	V-ing form
couldn't I devoice? couldn't you devoice? couldn't she devoice? couldn't we devoice? couldn't you devoice? couldn't they devoice?	couldn't I be devoicing? couldn't you be devoicing? couldn't she be devoicing? couldn't we be devoicing? couldn't you be devoicing? couldn't they be devoicing?
Perfect	V-ing perfect
couldn't I have devoiced? couldn't you have devoiced? couldn't she have devoiced? couldn't we have devoiced? couldn't you have devoiced? couldn't they have devoiced?	couldn't I have been devoicing? couldn't you have been devoicing? couldn't she have been devoicing? couldn't we have been devoicing? couldn't you have been devoicing? couldn't they have been devoicing?