I should add you should add he should add we should add you should add they should add
V-ing form
I should be adding you should be adding he should be adding we should be adding you should be adding they should be adding
Perfect
I should have added you should have added he should have added we should have added you should have added they should have added
V-ing perfect
I should have been adding you should have been adding he should have been adding we should have been adding you should have been adding they should have been adding
Negation
Simple form
I should not add you should not add he should not add we should not add you should not add they should not add
V-ing form
I should not be adding you should not be adding he should not be adding we should not be adding you should not be adding they should not be adding
Perfect
I should not have added you should not have added he should not have added we should not have added you should not have added they should not have added
V-ing perfect
I should not have been adding you should not have been adding he should not have been adding we should not have been adding you should not have been adding they should not have been adding
Interrogative form
Simple form
should I add? should you add? should he add? should we add? should you add? should they add?
V-ing form
should I be adding? should you be adding? should he be adding? should we be adding? should you be adding? should they be adding?
Perfect
should I have added? should you have added? should he have added? should we have added? should you have added? should they have added?
V-ing perfect
should I have been adding? should you have been adding? should he have been adding? should we have been adding? should you have been adding? should they have been adding?
Interro-negative form
Simple form
should I not add? should you not add? should he not add? should we not add? should you not add? should they not add?
V-ing form
should I not be adding? should you not be adding? should he not be adding? should we not be adding? should you not be adding? should they not be adding?
Perfect
should I not have added? should you not have added? should he not have added? should we not have added? should you not have added? should they not have added?
V-ing perfect
should I not have been adding? should you not have been adding? should he not have been adding? should we not have been adding? should you not have been adding? should they not have been adding?