Hello everybody, it is long time since I have been here. But I am back again.
I am working with Jan Van Steenbergen on the Slovianski project for a while now and there we had a long discussion about the slavic verbal aspect.
Actually I have more or less cast off the existing theories about the slavic verbal aspect because it only has lecks on explainations and it says you have got to learn every verb in pares.
I have made some researches for myself with some texts and find out a little bit new way of seeing and interpreting the verbal aspect in slavic languages, special for BCS now.
There are also some aberrations in some other slavic languages but I wont be mentioning them now, expect you want me to do so.
I will try to be short.
The curent state how linguists interpet the slavic aspect is:
1) there are
imperfective and
perfective aspects.
2) Imperfective aspect cares the meaning of
incompleteness
3) Perfective aspect denotes
completeness of the action
4) Perfective aspect is recognized after prefixes such as, s-, iz-, od-, na- etc. like
učiti vs
naučiti, raditi vs
uraditi etc.
5) You have to learn every pair by rote because they are irregular.
Well my system is a bit more schematic and kind of regular, so I say,
there is no need to learn every pair by rote. Instead you only need to understand my system and than you will be able to predict perfective vs imperfective.
Now I am going to bag to forget all you have learned about the slavic verbal aspect.
One wise man said "Empty your cup before you take some new tee". Otherwise the tee wont get into you cup but only flow out.
So dont allow yourself to be limited in your thoughts. Try to understand.
First of all, I will try to be as short as possible alhtough it is going to look very amply.
1) I say, we shouldnt make thoughts if the verb is completed (perfective) or incompleted (imperfective). Rather we should care if it is
progressive (continuous) or not.
2) I would not say that a pair is učiti naučiti because the semantical meaning is different. Similar but still different.
3) Now watch carefuly.
We have one normal aspect. It doesnt indicate if the actian is pregressive or not. It just cars normal, generall meaning of the action. I would like to call it
general aspect.
4) Almost all verbs can be prefixed. Those prefixes are affecting the meaning of the verb slightly or heavely so we can easely say it is another verb. When those verbs are prefixed we must care about the progressiveness of the action. So now we have got imperfect or perfect aspect. But I would rather call them progressive and improgressive.
There is one more criterion, beside progressiveness, and that is frequency but I will take a bit later about that because it is less important.
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So my system is:
Improgressive vs progressive
1) First indicates a period or a point of the action (like frozen water, ice)
2) Second is indicating fluentness of the action (like flow of water)
One example:
general : kupiti
collect
Now, I wanna ask you who still believe in the old system, is kupiti perfective or imperfective, thus, does it shows any completeness or incompleteness, perfectiveness or imperfectiveness? I tell you NO. It shows and indicates only a general meaning of the verb
to collect.
Now you would say for shure: "No, no, wait a sec amigo! Kupiti is imperfective aspect and the perfective would be skupiti."
Are you shure? Let me ask you, what would be than skupljati. Where does it fit in the present system of all linguists of slavic languages? skupljati has no place in that system. But in my yes.
Namely, the general meaning is kupiti. And we have an prefixed improgressive vs progressive pair. skup
iti vs skupl
jati.
And if you still say
skupiti is a pair of kupiti, what is then with
nakupiti,
okupiti,
iskupiti? Do they take any place in the present system? I doubt. But in mine, yes.
Do you notice how prefixes affect the menaing of the verb?
kupiti
collect
skupiti vs skupljati
aggregate, lit. collect together
nakupiti vs nakupoljati
collect enough
iskupiti vs iskupljati
callect from somewhere, collect all
okupiti vs okupljati
lit. collect around
Now notice well:
a) prefixes are enhancing the general meaning of the verb with details, mostely direction (with verbs of motion), completeness (all, little bit, enough), position (here, there, over, against, near, far etc.)
b) the verbal class, thus the last vowel of the stem, or some people recognize it as the interfix between the stem and the ending such es skup-
i-ti vs skup-
ja-ti. Is giving you the infirmation about progressiveness of the action. Thus if the verb is progressive like " I am collecting together" or improgressive like " I collect together".
You must ask yourself, how you are going to know which interfixes denote improgressiveness and which progressiveness. Dont worry, I will explain. Besides I made a table which showes you fonetic changes

I put the link down, you cant miss it.
For understanding slavic verbs you need to know the classification of verbs.
Which is made after the interfix that I mentioned above.
We have five classes of verbs generally.
consonant class: Infinitive ending in -sti and -ći. Those verbs have no interfix so they had to change the stem and the ending little bit.
pasti came from pa
d-ti and plesti came form ple
tti
d and t changed to s, this is a very old change, exists even in lithuanian and latvian, present is pad-am and plet-em. So only stems ending in d and t belong to -sti verbs. You will notice in the table
peći, moći came from pe
kti and mo
gti the little bit newer change, only slavic, Ukrainian and Belorussian still keep pekti and mogti. The present is peč-em and mož-em. You will notice that only stems ending in k and g have -ći infinitives and that they make palatalization k, g to č,ž in present.
All -sti and -ći verbs build progressive aspect with last vowel of the stam + ati. So it can be -dati, -tati and -kati, -gati.
ispasti - ispa
dati, zaplesti - zapli
tati
ispeći - ispe
cati, pomoći - poma
gati
i - class:
verbs like kup
iti in the improgressive they get -ja instead of -i- and this -ja- is palatalizing always. For that you must know the rule of palatalizations k,g,h --> č,ž,š
s,z-->š,ž
t,d-->ć,đ
l,r,n--->lj, rj, nj
p,b,v,m,f - plj, blj, vlj, mlj, flj
So skup-i-ti is going to be skup-ja-ti but since p+ja are giving plja its goint to be skupljati. The same way in present
da skupim vs
da skupljam
Now I wont be describing all classes. Instead of that I am going to upload the table here for the rest of the classes but it is important to me that you got the point of how the system is working. You will notice that it has a logic and analogy.
http://www3.pic-upload.de/13.08.10/8lx9mm2x3g4s.jpg
One thing more I must warn you!
Actually the general aspect verb can be progressive or not progressive, depending on the nature of the action the verb is describing. But the most of verbs apears only in one of the aspects, and most of time improgressive with the goal to perscribe only general meaning of the verb. And some but rare verbs can have both progressive and improgressive aspect alse when not prefixed but those are mostely verbs of motion like past vs padati
fall.
And there is one more thing. I mentioned it above. Besides of the criterion of progressiveness after that we aspects progressive and improgressive we also have the criterion of frequency of the action. As such we have semelfactive aspect and iterative aspect.
Semelfactive aspect denote a short and punctiliar action which hapened only one time. Such actian are denoting all -nuti verbs.
And when such an action is repeating than we have iterative aspect which is mostely equal to the progressive aspect. Those two, semelfactive and iterative aspects are used only casually and seldom.
skočiti - improgressive
skakati - progressive
skoknuti - semelfactive
skakivati - iterative
So the resume:
Instead of completeness we should pay care about progressiveness.
We have two main aspects improgressive and progressive, which you can call how do you want, I pickt up these two names only to denote the importance of the criterion we pay attention on.
Only prefixed verbs has both of the aspects. Verbs withou a prefix which I call general verbs can have both of the apscts but in 90% of cases they have only one form which is again in most of cases improgressive. The other progressive part is simply not used.
So we would have:
--------------improgressive vs progressive
general verbs -tonuti--- vs --- tanjati (but it is not used, actually use only for derivation of prefixed progressive verbs)
prefixed verbs-potonuti--vs--potanjati
And the whole the whole use of the apects depends on the natural meaning of the action. If something is impossible to do in the nature as progressive, then there wont be progressive aspect for that verb.
Sorry if everything has not been clear. I just have had a thought about a new more systematic system (at least there is a system now) for slavic verbal aspect. The idea is still new so I would appriciate any kind of critics so I can develop the system farther.
Thanks for you patience!
PS: Use the table so:
1) Pick up any verb you want.
2) Look at its interfix between the stem and the -ti infinitive ending. On this way you can determine the row.
3) Look at its last consonant of the stem. On this way you can determine the right column.