I should thumbtack you should thumbtack she should thumbtack we should thumbtack you should thumbtack they should thumbtack
V-ing form
I should be thumbtacking you should be thumbtacking she should be thumbtacking we should be thumbtacking you should be thumbtacking they should be thumbtacking
Perfect
I should have thumbtacked you should have thumbtacked she should have thumbtacked we should have thumbtacked you should have thumbtacked they should have thumbtacked
V-ing perfect
I should have been thumbtacking you should have been thumbtacking she should have been thumbtacking we should have been thumbtacking you should have been thumbtacking they should have been thumbtacking
Negation
Simple form
I should not thumbtack you should not thumbtack she should not thumbtack we should not thumbtack you should not thumbtack they should not thumbtack
V-ing form
I should not be thumbtacking you should not be thumbtacking she should not be thumbtacking we should not be thumbtacking you should not be thumbtacking they should not be thumbtacking
Perfect
I should not have thumbtacked you should not have thumbtacked she should not have thumbtacked we should not have thumbtacked you should not have thumbtacked they should not have thumbtacked
V-ing perfect
I should not have been thumbtacking you should not have been thumbtacking she should not have been thumbtacking we should not have been thumbtacking you should not have been thumbtacking they should not 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
should I not thumbtack? should you not thumbtack? should she not thumbtack? should we not thumbtack? should you not thumbtack? should they not thumbtack?
V-ing form
should I not be thumbtacking? should you not be thumbtacking? should she not be thumbtacking? should we not be thumbtacking? should you not be thumbtacking? should they not be thumbtacking?
Perfect
should I not have thumbtacked? should you not have thumbtacked? should she not have thumbtacked? should we not have thumbtacked? should you not have thumbtacked? should they not have thumbtacked?
V-ing perfect
should I not have been thumbtacking? should you not have been thumbtacking? should she not have been thumbtacking? should we not have been thumbtacking? should you not have been thumbtacking? should they not have been thumbtacking?