I'd be thumbtacking you'd be thumbtacking he'd be thumbtacking we'd be thumbtacking you'd be thumbtacking they'd be thumbtacking
Perfect
I should've thumbtacked you should've thumbtacked he should've thumbtacked we should've thumbtacked you should've thumbtacked they should've thumbtacked
V-ing perfect
I should've been thumbtacking you should've been thumbtacking he should've been thumbtacking we should've been thumbtacking you should've been thumbtacking they should've been thumbtacking
Negation
Simple form
I shouldn't thumbtack you shouldn't thumbtack he shouldn't thumbtack we shouldn't thumbtack you shouldn't thumbtack they shouldn't thumbtack
V-ing form
I shouldn't be thumbtacking you shouldn't be thumbtacking he shouldn't be thumbtacking we shouldn't be thumbtacking you shouldn't be thumbtacking they shouldn't be thumbtacking
Perfect
I shouldn't have thumbtacked you shouldn't have thumbtacked he shouldn't have thumbtacked we shouldn't have thumbtacked you shouldn't have thumbtacked they shouldn't have thumbtacked
V-ing perfect
I shouldn't have been thumbtacking you shouldn't have been thumbtacking he shouldn't have been thumbtacking we shouldn't have been thumbtacking you shouldn't have been thumbtacking they shouldn't have been thumbtacking
Interrogative form
Simple form
should I thumbtack? should you thumbtack? should he thumbtack? should we thumbtack? should you thumbtack? should they thumbtack?
V-ing form
should I be thumbtacking? should you be thumbtacking? should he be thumbtacking? should we be thumbtacking? should you be thumbtacking? should they be thumbtacking?
Perfect
should I have thumbtacked? should you have thumbtacked? should he have thumbtacked? should we have thumbtacked? should you have thumbtacked? should they have thumbtacked?
V-ing perfect
should I have been thumbtacking? should you have been thumbtacking? should he have been thumbtacking? should we have been thumbtacking? should you have been thumbtacking? should they have been thumbtacking?
Interro-negative form
Simple form
shouldn't I thumbtack? shouldn't you thumbtack? shouldn't he thumbtack? shouldn't we thumbtack? shouldn't you thumbtack? shouldn't they thumbtack?
V-ing form
shouldn't I be thumbtacking? shouldn't you be thumbtacking? shouldn't he be thumbtacking? shouldn't we be thumbtacking? shouldn't you be thumbtacking? shouldn't they be thumbtacking?
Perfect
shouldn't I have thumbtacked? shouldn't you have thumbtacked? shouldn't he have thumbtacked? shouldn't we have thumbtacked? shouldn't you have thumbtacked? shouldn't they have thumbtacked?
V-ing perfect
shouldn't I have been thumbtacking? shouldn't you have been thumbtacking? shouldn't he have been thumbtacking? shouldn't we have been thumbtacking? shouldn't you have been thumbtacking? shouldn't they have been thumbtacking?