I'd be thumbtacking you'd be thumbtacking she'd be thumbtacking we'd be thumbtacking you'd be thumbtacking they'd be thumbtacking
Perfect
I should've thumbtacked you should've thumbtacked she 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 she 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 she 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 she 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 she 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 she 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 she thumbtack? should we thumbtack? should you thumbtack? should they thumbtack?
V-ing form
should I be thumbtacking? should you be thumbtacking? should she be thumbtacking? should we be thumbtacking? should you be thumbtacking? should they be thumbtacking?
Perfect
should I have thumbtacked? should you have thumbtacked? should she 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 she 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 she 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 she 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 she 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 she have been thumbtacking? shouldn't we have been thumbtacking? shouldn't you have been thumbtacking? shouldn't they have been thumbtacking?