Expressing continuation with "hai (还)" - HSK 2 Grammar
Although 还 (hái) has many meanings, the basic meaning of "still" to indicate a continuing action is essential to mastery of the word.
Usage of 还在
Often the auxiliary verb 在 (zài) will appear with 还 (hái), as it is natural to talk about continuous actions that are still happening.
Usage of 还是
Here 还是 (háishì)--not literally "still is"--indicates what happened or will happen, despite the situation. The 是 (shì) here doesn't have a clear meaning here independent of 还 (hái).
Negative Form
When you put 不 or 没 after 还 (hái) in a question sentence, it can be used to emphasize the idea of what should be happening in a more idiomatic way.