English verb conjugation
SHOULD DOUBT

Regular verb: doubt - doubted - doubted

Affirmation

Simple form	V-ing form
I'd doubt you'd doubt he'd doubt we'd doubt you'd doubt they'd doubt	I'd be doubting you'd be doubting he'd be doubting we'd be doubting you'd be doubting they'd be doubting
Perfect	V-ing perfect
I should've doubted you should've doubted he should've doubted we should've doubted you should've doubted they should've doubted	I should've been doubting you should've been doubting he should've been doubting we should've been doubting you should've been doubting they should've been doubting

Negation

Simple form	V-ing form
I shouldn't doubt you shouldn't doubt he shouldn't doubt we shouldn't doubt you shouldn't doubt they shouldn't doubt	I shouldn't be doubting you shouldn't be doubting he shouldn't be doubting we shouldn't be doubting you shouldn't be doubting they shouldn't be doubting
Perfect	V-ing perfect
I shouldn't have doubted you shouldn't have doubted he shouldn't have doubted we shouldn't have doubted you shouldn't have doubted they shouldn't have doubted	I shouldn't have been doubting you shouldn't have been doubting he shouldn't have been doubting we shouldn't have been doubting you shouldn't have been doubting they shouldn't have been doubting

Interrogative form

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

Interro-negative form

Simple form	V-ing form
shouldn't I doubt? shouldn't you doubt? shouldn't he doubt? shouldn't we doubt? shouldn't you doubt? shouldn't they doubt?	shouldn't I be doubting? shouldn't you be doubting? shouldn't he be doubting? shouldn't we be doubting? shouldn't you be doubting? shouldn't they be doubting?
Perfect	V-ing perfect
shouldn't I have doubted? shouldn't you have doubted? shouldn't he have doubted? shouldn't we have doubted? shouldn't you have doubted? shouldn't they have doubted?	shouldn't I have been doubting? shouldn't you have been doubting? shouldn't he have been doubting? shouldn't we have been doubting? shouldn't you have been doubting? shouldn't they have been doubting?