English verb conjugation
SHOULD MARK

Regular verb: mark - marked - marked

Affirmation

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

Negation

Simple form	V-ing form
I should not mark you should not mark he should not mark we should not mark you should not mark they should not mark	I should not be marking you should not be marking he should not be marking we should not be marking you should not be marking they should not be marking
Perfect	V-ing perfect
I should not have marked you should not have marked he should not have marked we should not have marked you should not have marked they should not have marked	I should not have been marking you should not have been marking he should not have been marking we should not have been marking you should not have been marking they should not 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
should I not mark? should you not mark? should he not mark? should we not mark? should you not mark? should they not mark?	should I not be marking? should you not be marking? should he not be marking? should we not be marking? should you not be marking? should they not be marking?
Perfect	V-ing perfect
should I not have marked? should you not have marked? should he not have marked? should we not have marked? should you not have marked? should they not have marked?	should I not have been marking? should you not have been marking? should he not have been marking? should we not have been marking? should you not have been marking? should they not have been marking?