liberatus sum is "standard," but you'll definitely encounter other orders, esp. in outside reading.
also, keep in mind that, often, there's only a blurry distinction between perfect passive verbs, and predicate adjectives. thus, "paratus sum" could just as well be "i am prepared," without the meaning "i have been prepared".. in fact, the whole "perfect passive" thing can be much easier if you take it literally, as "adjective + to be," and memorize the paradigms like that.
perhaps analogous to this, i was a fluent speaker of russian before ever studying it formally. thus, imagine my surprise when a simple, common word like "Ð·Ð°ÐºÑ€Ñ‹Ñ‚Ñ‹Ð¹" ("shut") was technically called a "past passive participle," and not an adjective. sure, it's usable both ways, and participles are technically adjectives, too, but only a linguist or a foreigner would think of the above as a participle. that sounds like a mere quibble, but remember that english students learning latin through wheelock, etc., will render perfect passives and participles in rather clunky, verbose ways, adding, perhaps, a nuance that's not in the original (such as, an implied agent, e.g. "the door has been shut").
Last edited by Alex Sheremet
on Fri Aug 15, 2008 8:53 pm, edited 1 time in total.