I have been reading into Balto-Slavic languages and come across a problem. "To need" is always imperfective.
If I use the imperfective past verb, "to need," I am going to be still, presently needing something (because the verb is viewed internally).
That works fine, but what if I needed something in the past and I stopped needing it? If I stopped needing something, that would mean that the "process" of needing has concluded and I am viewing it from outside the duration of that action. This would require a perfective though, and almost none of the Slavic languages have them for that verb.
My reference words are наблюдать and нуждаться.
NOTE: I am talking about the perfective aspect NOT a perfect tense.