I agree with everything iCake wrote.
Just want to add some thought on "ещё".
At the first glance, it may seem too complicated for it has so many meanings and different ways of being translated into English (still, else, yet, more, also...). However, I'd like to offer some advice:
1. You are not required to learn all its usages at once. I think it would be much easier if you learn the ways it is used step by step.
2. However, there is something which makes us, native speakers, think it is the same word. It is better not just to learn all its special meanings (which might seem unrelated), but to grasp the basic idea what it has in common in all those usages.
My opinion is that the main idea of "ещё" is addition or continuation. Even the addition can be thought of as a continuation of a list (when you add an item to a list of items, you continue the list). I will try to apply this concept to all iCake's examples.
- I continue living in Russia.
The cigarette continues being not smoked to the end. Imagine it in the time scale: Я не выкурил (it assumes I am in the process of smoking, but did not finish it) - Я не выкурил - Я не выкурил - Я ещё не выкурил (this state still continues).Originally Posted by iCake
- He was smart. To continue (describing him), he was strong.Originally Posted by iCake
- He's a student, but to continue (describing him) he's a family man.Originally Posted by iCake
- I will continue my experiences of living in Russia (this time is not the last time, it is to be continued).Originally Posted by iCake
- It assumes I have some money already, but it is not enough. So, I need you to continue supplying me with money.Originally Posted by iCake
Actually, this sense is very common, you can learn it from some short expressions like "кто-то ещё" (someone else), "что-то ещё" (something else), "где-то ещё" (somewhere else), "ещё один час" (one hour more), "ещё два стакана" (to glasses more) etc. It means addition, but as I wrote above, addition IS continuation.
- "Я не курил сигарету" implies the action has never started. And this state continues up to the present moment (and maybe more). Again, imagine it in the time scale: Я не курил (I did not smoke = never started smoking it) - Я не курил - Я не курил - Я ещё не курил (this state still continues).Originally Posted by iCake