Full Idea
Deontic modality can be divided into sentence-modifying 'ought-to-be' modals, and predicate-modifying 'ought-to-do' modals.
Gist of Idea
Deontic modalities are 'ought-to-be', for sentences, and 'ought-to-do' for predicates
Source
Barbara Vetter (Potentiality [2015], 6.9.2)
Book Reference
Vetter,Barbara: 'Potentiality: from Dispositions to Modality' [OUP 2015], p.239
A Reaction
[She cites Brennan 1993] These two seem to correspond to what is 'good' (ought to be), and what is 'right' (ought to do). Since I like that distinction, I also like this one.