r. up to the present time
r. within an indefinite time or at an unspecified future time
adv. 还, 尚, 仍然, 已经, 然而
conj. 然而
1. I haven't finished my homework yet.
我还没有完成我的作业。
2. She is not here yet, but she will come soon.
她还没到，但她很快就会来。
3. Have you eaten yet?
你吃过饭了吗？