English verb conjugation
SHOULD MAINTAIN

Regular verb: maintain - maintained - maintained

Affirmation

Simple form	V-ing form
I'd maintain you'd maintain he'd maintain we'd maintain you'd maintain they'd maintain	I'd be maintaining you'd be maintaining he'd be maintaining we'd be maintaining you'd be maintaining they'd be maintaining
Perfect	V-ing perfect
I should've maintained you should've maintained he should've maintained we should've maintained you should've maintained they should've maintained	I should've been maintaining you should've been maintaining he should've been maintaining we should've been maintaining you should've been maintaining they should've been maintaining

Negation

Simple form	V-ing form
I shouldn't maintain you shouldn't maintain he shouldn't maintain we shouldn't maintain you shouldn't maintain they shouldn't maintain	I shouldn't be maintaining you shouldn't be maintaining he shouldn't be maintaining we shouldn't be maintaining you shouldn't be maintaining they shouldn't be maintaining
Perfect	V-ing perfect
I shouldn't have maintained you shouldn't have maintained he shouldn't have maintained we shouldn't have maintained you shouldn't have maintained they shouldn't have maintained	I shouldn't have been maintaining you shouldn't have been maintaining he shouldn't have been maintaining we shouldn't have been maintaining you shouldn't have been maintaining they shouldn't have been maintaining

Interrogative form

Simple form	V-ing form
should I maintain? should you maintain? should he maintain? should we maintain? should you maintain? should they maintain?	should I be maintaining? should you be maintaining? should he be maintaining? should we be maintaining? should you be maintaining? should they be maintaining?
Perfect	V-ing perfect
should I have maintained? should you have maintained? should he have maintained? should we have maintained? should you have maintained? should they have maintained?	should I have been maintaining? should you have been maintaining? should he have been maintaining? should we have been maintaining? should you have been maintaining? should they have been maintaining?

Interro-negative form

Simple form	V-ing form
shouldn't I maintain? shouldn't you maintain? shouldn't he maintain? shouldn't we maintain? shouldn't you maintain? shouldn't they maintain?	shouldn't I be maintaining? shouldn't you be maintaining? shouldn't he be maintaining? shouldn't we be maintaining? shouldn't you be maintaining? shouldn't they be maintaining?
Perfect	V-ing perfect
shouldn't I have maintained? shouldn't you have maintained? shouldn't he have maintained? shouldn't we have maintained? shouldn't you have maintained? shouldn't they have maintained?	shouldn't I have been maintaining? shouldn't you have been maintaining? shouldn't he have been maintaining? shouldn't we have been maintaining? shouldn't you have been maintaining? shouldn't they have been maintaining?