21. You mean when used in the vocative sense of'O, Caesar '? 22. Irregular vocatives exist as well, such as nom . ????????, voc . ????????. 23. Proper nouns usually also have vocative forms, even though they are used less frequently. 24. Proper nouns are never placed first in the sentence, except in a vocative sense. 25. The vocative is distinguished from the nominative in the case of only a few nouns. 26. But interjections may express commands too, and it seems to me so do vocatives . 27. This happens because the vocative is often perceived as very direct and thus can seem rude. 28. As specified above, the vocative case in Romanian has a special form for most nouns. 29. No prepositions are matched with the vocative , because it is used for addressing people only. 30. In many cases this means that ( in the singular ) masculine vocative expressions resemble the nominative.
