English verb conjugation
COULD DISBELIEVE

Regular verb: disbelieve - disbelieved - disbelieved

Affirmation

Simple form	V-ing form
I could disbelieve you could disbelieve he could disbelieve we could disbelieve you could disbelieve they could disbelieve	I could be disbelieving you could be disbelieving he could be disbelieving we could be disbelieving you could be disbelieving they could be disbelieving
Perfect	V-ing perfect
I could have disbelieved you could have disbelieved he could have disbelieved we could have disbelieved you could have disbelieved they could have disbelieved	I could have been disbelieving you could have been disbelieving he could have been disbelieving we could have been disbelieving you could have been disbelieving they could have been disbelieving

Negation

Simple form	V-ing form
I couldn't disbelieve you couldn't disbelieve he couldn't disbelieve we couldn't disbelieve you couldn't disbelieve they couldn't disbelieve	I couldn't be disbelieving you couldn't be disbelieving he couldn't be disbelieving we couldn't be disbelieving you couldn't be disbelieving they couldn't be disbelieving
Perfect	V-ing perfect
I couldn't have disbelieved you couldn't have disbelieved he couldn't have disbelieved we couldn't have disbelieved you couldn't have disbelieved they couldn't have disbelieved	I couldn't have been disbelieving you couldn't have been disbelieving he couldn't have been disbelieving we couldn't have been disbelieving you couldn't have been disbelieving they couldn't have been disbelieving

Interrogative form

Simple form	V-ing form
could I disbelieve? could you disbelieve? could he disbelieve? could we disbelieve? could you disbelieve? could they disbelieve?	could I be disbelieving? could you be disbelieving? could he be disbelieving? could we be disbelieving? could you be disbelieving? could they be disbelieving?
Perfect	V-ing perfect
could I have disbelieved? could you have disbelieved? could he have disbelieved? could we have disbelieved? could you have disbelieved? could they have disbelieved?	could I have been disbelieving? could you have been disbelieving? could he have been disbelieving? could we have been disbelieving? could you have been disbelieving? could they have been disbelieving?

Interro-negative form

Simple form	V-ing form
couldn't I disbelieve? couldn't you disbelieve? couldn't he disbelieve? couldn't we disbelieve? couldn't you disbelieve? couldn't they disbelieve?	couldn't I be disbelieving? couldn't you be disbelieving? couldn't he be disbelieving? couldn't we be disbelieving? couldn't you be disbelieving? couldn't they be disbelieving?
Perfect	V-ing perfect
couldn't I have disbelieved? couldn't you have disbelieved? couldn't he have disbelieved? couldn't we have disbelieved? couldn't you have disbelieved? couldn't they have disbelieved?	couldn't I have been disbelieving? couldn't you have been disbelieving? couldn't he have been disbelieving? couldn't we have been disbelieving? couldn't you have been disbelieving? couldn't they have been disbelieving?