In later medieval and in modern times there have been comparatively few apparent changes in our case system apart from the gradual replacement of 'thou-thee' (singular) and subjective 'ye' -objective 'you' (plural) by a single undifferentiated form 'you'.
- Sapir (1921), a pag.164

[...] the case system, such as it is (subjective-objective, really absolutive, and possessive in nouns; subjective, objective, and possessive in certain pronouns) has been steadily weakening in psychological respects.
- Sapir (1921), a pag.164

[...] our English case system is weaker than it looks and [...] is destined to get itself reduced to an absolutive (caseless) form for all nouns and pronouns but those that are animate.
- Sapir (1921), a pag.168