Another little bit of knowledge about aspect is available here:
http://forum.learnnavi.org/vocab-phrases/no-su-this-day/msg461795/#msg461795and following post
ta omängum fra'uti.
There are lots of information about aspect and tense on this forum, but i think that the very important thing is to find and realize in what way exactly they works in your native language. With that knowledge, you can then compare them with Na’vi.
For example, how your native language differ between these:
Tomorrow, i will hunt the yerik. (Trray oel talyaron yerikit.) - future tense combined with perfective aspect
You want to succesfully hunt the yerik - you want to finish the hunt tomorrow, and to have some steaks for dinner.
So, you want to accomplish some results, you want to finish that action tomorrow.
In another words, tomorrow, when you will land your ikran next to yerik that you killed, it is about perfective (
ol) aspect - the action is done.
Tomorrow, i will be hunting the yerik. (Trray oel taryaron yerikit.) - future tense combined with imperfective aspect
Doesn't matter if you will succeed or not, you are simply going to hunt tomorrow regardless of result.
All what you want is hunting tomorrow.
In another words, tomorrow, when you will be still flying over a some yeriks, it is about imperfective (
er) aspect - the action is still in progress.
To succesfully understand the tense/aspect system in Na’vi, try to separate them and look at some action from viewpoint of tense/aspect separately:
-Tense: "Is the action placed to the past, to the future, or it is happening now?"
-Aspect: "Am i talking about already finished action, or this action was/will be/is in progress?"