but and ben

例句：

1. 1. He is a good teacher but not very patient.
   他是个好老师，但不太有耐心。
2. 2. She has a lot of friends but no close ones.
   她有很多朋友，但没有亲密的朋友。
3. 3. The weather was fine but it started to rain.
   天气很好，但开始下雨了。