English verb conjugation
SHOULD MARK

Regular verb: mark - marked - marked

Affirmation

Simple form	V-ing form
I'd mark you'd mark he'd mark we'd mark you'd mark they'd mark	I'd be marking you'd be marking he'd be marking we'd be marking you'd be marking they'd be marking
Perfect	V-ing perfect
I should've marked you should've marked he should've marked we should've marked you should've marked they should've marked	I should've been marking you should've been marking he should've been marking we should've been marking you should've been marking they should've been marking

Negation

Simple form	V-ing form
I shouldn't mark you shouldn't mark he shouldn't mark we shouldn't mark you shouldn't mark they shouldn't mark	I shouldn't be marking you shouldn't be marking he shouldn't be marking we shouldn't be marking you shouldn't be marking they shouldn't be marking
Perfect	V-ing perfect
I shouldn't have marked you shouldn't have marked he shouldn't have marked we shouldn't have marked you shouldn't have marked they shouldn't have marked	I shouldn't have been marking you shouldn't have been marking he shouldn't have been marking we shouldn't have been marking you shouldn't have been marking they shouldn't have been marking

Interrogative form

Simple form	V-ing form
should I mark? should you mark? should he mark? should we mark? should you mark? should they mark?	should I be marking? should you be marking? should he be marking? should we be marking? should you be marking? should they be marking?
Perfect	V-ing perfect
should I have marked? should you have marked? should he have marked? should we have marked? should you have marked? should they have marked?	should I have been marking? should you have been marking? should he have been marking? should we have been marking? should you have been marking? should they have been marking?

Interro-negative form

Simple form	V-ing form
shouldn't I mark? shouldn't you mark? shouldn't he mark? shouldn't we mark? shouldn't you mark? shouldn't they mark?	shouldn't I be marking? shouldn't you be marking? shouldn't he be marking? shouldn't we be marking? shouldn't you be marking? shouldn't they be marking?
Perfect	V-ing perfect
shouldn't I have marked? shouldn't you have marked? shouldn't he have marked? shouldn't we have marked? shouldn't you have marked? shouldn't they have marked?	shouldn't I have been marking? shouldn't you have been marking? shouldn't he have been marking? shouldn't we have been marking? shouldn't you have been marking? shouldn't they have been marking?