N5
まだ
Still
冷蔵庫にケーキがまだあります。
There is still cake in the fridge.
Explanation
「まだ」 has 2 uses
1Still
With a positive verb: it is still going on, often with 〜ている, ある or いる: 「雨がまだ降っている」 (It is still raining).
冷蔵庫にケーキがまだあります。
There is still cake in the fridge.
まだ親がいるからゲームできない。
My parents are still here, so I can't play games.
2Not yet
With a negative: it has not happened yet: 「バスはまだ来ない」 (The bus has not come yet).
バスはまだ来ません。
The bus has not come yet.
その映画はまだ見ていません。
I have not seen that film yet.
Mixed up with
In an affirmative sentence 「まだ」 carries a feeling of 'why is it still …': 「11時なのに、まだ起きないの？」 (It's already eleven and you're still not up?)
In a negative sentence it carries the expectation 'it should have happened by now, but it hasn't': 「新幹線はまだ来ません」. When someone asks 「もう〜ましたか」, the most natural negative answer is 「いいえ、まだです」.