还 hái still

still; also; even

hái (still; also) and huán (to give back): 还有 háiyǒu, 还书 huán shū

怎么记住“还”: 辶 walking + 不 not = still. After six hours of walking the scouts are not at the lake yet, and the kids at the back are still asking.

部件结构

形声 · Meaning + sound

originally 辵 + 睘

One part gives the meaning, the other gives the sound.

还 = 辶 walking + 不 not

Gushi 故事

After six hours of walking the scouts are not at the lake yet, and the kids at the back are still asking.

In the full form, walking gives the meaning and the other part gave the sound; the word first meant to go back.

'Still / also / even', before the verb: 还在睡 (hái zài shuì) still asleep, 还有 (háiyǒu) there's also/more, 比这还好 (bǐ zhè hái hǎo) even better than this.
还是 (háishi) means 'or' in questions (茶还是咖啡? tea or coffee?) and 'had better' in suggestions (还是走吧 we'd better go).
Read huán it's a different word, 'to give back / return': 还书 (huán shū) return a book, 归还 (guīhuán) return something.