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