Verb-initial languages tend to have polypersonal agreement; that is, the verb agrees with both the subject and (at least one, maybe more of) the object(s). Verb-final languages tend to have rich case systems; that is, the subject noun-phrase is case-marked as subject and the object noun-phrase(s) is(are) case-marked as object (and/or indirect object etc.). The explanation for this is that languages like to establish the roles as early in the phrase as possible. But, if that were so, wouldn't SVO languages case-mark the subject and have the verb agree with the object? But mostly they don't; rather, they tend to have the verb agree with the subject (if anything), and to case-mark only the object (if either grammatical relation). Am I wrong? If I'm right, why do SVO languages usually case-mark the object but not the subject, and also usually have the verbs agree with the subject but not the object, instead of the other way 'round? 1% of the world's languages are OVS; if the "establish roles as early as possible" idea is correct, the object (rather than the subject) should be case- marked and the verb should agree with the subject (rather than with the object). Is that what happens in those languages?