not yet 还没
A:Are you ready?
你准备好了吗?
B:Not yet.
还没。
I have not yet found their key.
我还没有发现他们的钥匙。
A:Have you finished your homework?
你完成你的家庭作业了吗?
B：Not yet,just half of it.how about you?
没呢，才完成了一半，你呢?
