I was wondering if anyone was aware of a resource - online, book, anything, really - where I could ascertain the perfective aspect, prefixed form a verb if I know/input the imperfective aspect.
The primary resource I'm relying on is Complete Latvian by Terēze Bartholomew. I'm quite satisfied with the progress I've made relying on this book, but she covers the function of making a perfective aspect by adding a prefix only very perfunctorily, and it is entirely "by accident," that I've learned a few imperfective/perfective pairs (darīt / izdarīt, rakstīt / uzrakstīt, dzert / iedzert), "accidentally" because I've just encountered these words in dialog in different parts of the book and just managed to figure out that they were an aspect pair. In other words, there's nothing systematic about it, no vocab lists that say to do : darīt, imperfective, izdarīt, perfective. You just encounter darīt in one lesson and then three lessons you see izdarīt in a dialog and just have to figure it out.
I'm also using as a reference Latvian: an Essential Grammar by Dace Prauliņš. Again, I think it to be a very useful resource but the coverage of aspect but it's still only cursory. Section 8.4 (nepabeigtie un pabeigtie darbības veidi) teaches me that a prefix almost always means a verb is now of the perfective aspect, but A) only one particular prefix is just pure, abstract, "perfectivization" but others make the verb perfective *and* change the meaning, eg. rakstīt - imperfective, norakstīt - to copy, parakstīt - to sign, pārrakstīt - to rewrite, and then, finally, the magic "uz-" in "uzrakstīt" which is that one "just perfective, no special meaning" prefix rakstīt - to be writing, uzrakstīt - to finish writing. BUT, B) that special prefix that serves only the purpose of making a verb perfective aspect without fundamentally changing its meaning CAN be different for every verb. So this basically means to me that, well, even though it's rakstīt and uzrakstīt I can't just go adding uz- to every imperfective aspect verb I know. So it's pirkt / nopirkt, and ēst / paēst.
So here's the problem I have as I continue my Latvian language journey: whenever I "learn" a new verb it feels woefully incomplete. When I learn a new verb - let's just so for example it's ēst - then I know how to say "I am eating," "I eat (regularly)," "I was eating," and "I will be eating," BUT I do not know how I to say "I ate (completely)," or "I will eat (to completion)." I can't just add prefixes willy-nilly, because there's only one or two that signify perfect aspect, and worse, other prefixes could completely change the meaning. So basically, are there any dictionaries, books, online sites, with which I could find out the prefixed, perfective aspect form of the verb by entering or looking up the unprefixed, imperfective aspect?
Liels paldies par palīdzību!