1). "încă nu înțeleg" - the action of understanding (a înțelege) didn't happen yet, but is likely to happen in the near future.
2). "nu mai înţeleg" - the action of understanding has happened in the past, but due to new informations added the subject doesn't understand anymore. (the action of understanding has stopped)
3). "încă mai înțeleg" - the action of understanding has happened in the past, continues to happen in the present, but the future is uncertain.
1). "tot nu înțeleg" - the action of not understanding has happened in the past and continues to happen in the present, again the future is uncertain
Both "mai" and "încă" are used to denote a repetitive action that has happened in the past and continues to happen in the future; therefor "inca nu mai inteleg" is incorrect because it contains both an affirmative and a negative repetitive adv. in regards to the action of understanding ("încă" and "nu mai").
Mai
- adverb of comparison
Mai bun = Better
Mai frecvent = More frequently
Te iubesc mai mult ca niciodată. = I love you more than ever.
- used to form the superlative form of adverbs
Tu ești cel mai bun/Tu ești cea mai bună (m/f) = You are the best.
Um, plenty more to write on these words, i'll be back when i get home, right now i need to leave my office.
Pa pa (Bye bye)