I'd mark you'd mark she'd mark we'd mark you'd mark they'd mark
V-ing form
I'd be marking you'd be marking she'd be marking we'd be marking you'd be marking they'd be marking
Perfect
I should've marked you should've marked she should've marked we should've marked you should've marked they should've marked
V-ing perfect
I should've been marking you should've been marking she should've been marking we should've been marking you should've been marking they should've been marking
Negation
Simple form
I shouldn't mark you shouldn't mark she shouldn't mark we shouldn't mark you shouldn't mark they shouldn't mark
V-ing form
I shouldn't be marking you shouldn't be marking she shouldn't be marking we shouldn't be marking you shouldn't be marking they shouldn't be marking
Perfect
I shouldn't have marked you shouldn't have marked she shouldn't have marked we shouldn't have marked you shouldn't have marked they shouldn't have marked
V-ing perfect
I shouldn't have been marking you shouldn't have been marking she 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
should I mark? should you mark? should she mark? should we mark? should you mark? should they mark?
V-ing form
should I be marking? should you be marking? should she be marking? should we be marking? should you be marking? should they be marking?
Perfect
should I have marked? should you have marked? should she have marked? should we have marked? should you have marked? should they have marked?
V-ing perfect
should I have been marking? should you have been marking? should she have been marking? should we have been marking? should you have been marking? should they have been marking?
Interro-negative form
Simple form
shouldn't I mark? shouldn't you mark? shouldn't she mark? shouldn't we mark? shouldn't you mark? shouldn't they mark?
V-ing form
shouldn't I be marking? shouldn't you be marking? shouldn't she be marking? shouldn't we be marking? shouldn't you be marking? shouldn't they be marking?
Perfect
shouldn't I have marked? shouldn't you have marked? shouldn't she have marked? shouldn't we have marked? shouldn't you have marked? shouldn't they have marked?
V-ing perfect
shouldn't I have been marking? shouldn't you have been marking? shouldn't she have been marking? shouldn't we have been marking? shouldn't you have been marking? shouldn't they have been marking?