English verb conjugation
COULD DOUBT DOUBT DOUBT DOUBT

Regular verb: doubt doubt doubt doubt - doubt doubt doubt doubted - doubt doubt doubt doubted

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could doubt doubt doubt doubt you could doubt doubt doubt doubt she could doubt doubt doubt doubt we could doubt doubt doubt doubt you could doubt doubt doubt doubt they could doubt doubt doubt doubt	I could be doubt doubt doubt doubting you could be doubt doubt doubt doubting she could be doubt doubt doubt doubting we could be doubt doubt doubt doubting you could be doubt doubt doubt doubting they could be doubt doubt doubt doubting
Perfect	V-ing perfect
I could have doubt doubt doubt doubted you could have doubt doubt doubt doubted she could have doubt doubt doubt doubted we could have doubt doubt doubt doubted you could have doubt doubt doubt doubted they could have doubt doubt doubt doubted	I could have been doubt doubt doubt doubting you could have been doubt doubt doubt doubting she could have been doubt doubt doubt doubting we could have been doubt doubt doubt doubting you could have been doubt doubt doubt doubting they could have been doubt doubt doubt doubting

Negation

Simple form	V-ing form
I could not doubt doubt doubt doubt you could not doubt doubt doubt doubt she could not doubt doubt doubt doubt we could not doubt doubt doubt doubt you could not doubt doubt doubt doubt they could not doubt doubt doubt doubt	I could not be doubt doubt doubt doubting you could not be doubt doubt doubt doubting she could not be doubt doubt doubt doubting we could not be doubt doubt doubt doubting you could not be doubt doubt doubt doubting they could not be doubt doubt doubt doubting
Perfect	V-ing perfect
I could not have doubt doubt doubt doubted you could not have doubt doubt doubt doubted she could not have doubt doubt doubt doubted we could not have doubt doubt doubt doubted you could not have doubt doubt doubt doubted they could not have doubt doubt doubt doubted	I could not have been doubt doubt doubt doubting you could not have been doubt doubt doubt doubting she could not have been doubt doubt doubt doubting we could not have been doubt doubt doubt doubting you could not have been doubt doubt doubt doubting they could not have been doubt doubt doubt doubting

Interrogative form

Simple form	V-ing form
could I doubt doubt doubt doubt? could you doubt doubt doubt doubt? could she doubt doubt doubt doubt? could we doubt doubt doubt doubt? could you doubt doubt doubt doubt? could they doubt doubt doubt doubt?	could I be doubt doubt doubt doubting? could you be doubt doubt doubt doubting? could she be doubt doubt doubt doubting? could we be doubt doubt doubt doubting? could you be doubt doubt doubt doubting? could they be doubt doubt doubt doubting?
Perfect	V-ing perfect
could I have doubt doubt doubt doubted? could you have doubt doubt doubt doubted? could she have doubt doubt doubt doubted? could we have doubt doubt doubt doubted? could you have doubt doubt doubt doubted? could they have doubt doubt doubt doubted?	could I have been doubt doubt doubt doubting? could you have been doubt doubt doubt doubting? could she have been doubt doubt doubt doubting? could we have been doubt doubt doubt doubting? could you have been doubt doubt doubt doubting? could they have been doubt doubt doubt doubting?

Interro-negative form

Simple form	V-ing form
could I not doubt doubt doubt doubt? could you not doubt doubt doubt doubt? could she not doubt doubt doubt doubt? could we not doubt doubt doubt doubt? could you not doubt doubt doubt doubt? could they not doubt doubt doubt doubt?	could I not be doubt doubt doubt doubting? could you not be doubt doubt doubt doubting? could she not be doubt doubt doubt doubting? could we not be doubt doubt doubt doubting? could you not be doubt doubt doubt doubting? could they not be doubt doubt doubt doubting?
Perfect	V-ing perfect
could I not have doubt doubt doubt doubted? could you not have doubt doubt doubt doubted? could she not have doubt doubt doubt doubted? could we not have doubt doubt doubt doubted? could you not have doubt doubt doubt doubted? could they not have doubt doubt doubt doubted?	could I not have been doubt doubt doubt doubting? could you not have been doubt doubt doubt doubting? could she not have been doubt doubt doubt doubting? could we not have been doubt doubt doubt doubting? could you not have been doubt doubt doubt doubting? could they not have been doubt doubt doubt doubting?