>>Unfortunately they forgot that part of the whole reason to learn Latin was to understand a very ordered grammatical system. They discarded "nominative" and "vocative" (amo, amas, amat .. )<<

I'm with you jmh, I learned most of my grammar from studying foreign languages - and a great help it was to me when I ended up teaching English in Japan, which is I suspect part of the reason William started this thread in the first place!

But 'amo, amas, amat...' is not nominative and vocative. Nominative and vocative are for noun declensions, not conjugating verbs. English nouns (thankfully!) don't decline, but pronouns do. See the old-fashioned pronoun thread if you feel strong enough.