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