English verb conjugation
SHOULD POSTMARK

Regular verb: postmark - postmarked - postmarked

Affirmation

Simple form	V-ing form
I should postmark you should postmark he should postmark we should postmark you should postmark they should postmark	I should be postmarking you should be postmarking he should be postmarking we should be postmarking you should be postmarking they should be postmarking
Perfect	V-ing perfect
I should have postmarked you should have postmarked he should have postmarked we should have postmarked you should have postmarked they should have postmarked	I should have been postmarking you should have been postmarking he should have been postmarking we should have been postmarking you should have been postmarking they should have been postmarking

Negation

Simple form	V-ing form
I should not postmark you should not postmark he should not postmark we should not postmark you should not postmark they should not postmark	I should not be postmarking you should not be postmarking he should not be postmarking we should not be postmarking you should not be postmarking they should not be postmarking
Perfect	V-ing perfect
I should not have postmarked you should not have postmarked he should not have postmarked we should not have postmarked you should not have postmarked they should not have postmarked	I should not have been postmarking you should not have been postmarking he should not have been postmarking we should not have been postmarking you should not have been postmarking they should not have been postmarking

Interrogative form

Simple form	V-ing form
should I postmark? should you postmark? should he postmark? should we postmark? should you postmark? should they postmark?	should I be postmarking? should you be postmarking? should he be postmarking? should we be postmarking? should you be postmarking? should they be postmarking?
Perfect	V-ing perfect
should I have postmarked? should you have postmarked? should he have postmarked? should we have postmarked? should you have postmarked? should they have postmarked?	should I have been postmarking? should you have been postmarking? should he have been postmarking? should we have been postmarking? should you have been postmarking? should they have been postmarking?

Interro-negative form

Simple form	V-ing form
should I not postmark? should you not postmark? should he not postmark? should we not postmark? should you not postmark? should they not postmark?	should I not be postmarking? should you not be postmarking? should he not be postmarking? should we not be postmarking? should you not be postmarking? should they not be postmarking?
Perfect	V-ing perfect
should I not have postmarked? should you not have postmarked? should he not have postmarked? should we not have postmarked? should you not have postmarked? should they not have postmarked?	should I not have been postmarking? should you not have been postmarking? should he not have been postmarking? should we not have been postmarking? should you not have been postmarking? should they not have been postmarking?