han't

例句：

1. 1. I haven't seen him since we graduated.
   自从我们毕业以来，我还没见到他。
2. 2.Haven't you heard about the newmovie?
   你难道没听说过那部新电影吗？
3. 3. We haven't finished ourhomework yet.
   我们还没有完成作业。