because、although、but：把句子连起来
说清原因和转折，避免照搬中文的成对连接词。
内容更新：
进入本课练习 →这一课学什么
- because 说明原因，so 引出结果
- although 引出让步，but 连接转折
because 说明原因，so 引出结果
We stayed home because it rained 先说结果，再给原因。It rained, so we stayed home 先说原因，再给结果。中文可以说“因为……所以……”，本课的标准英语句型选择其中一套连接方式。
I took the bus because it was raining.
因为在下雨，我坐了公交车。
The shop was closed, so we went home.
商店关门了，所以我们回家了。
although 引出让步，but 连接转折
Although I was tired, I finished the task 与 I was tired, but I finished the task 都表达转折。although 后需要一个句子；despite 后通常接名词或动词-ing。
Although the room is small, it is comfortable.
虽然房间小，但很舒适。
It was cold, but we enjoyed the walk.
天很冷，但我们享受了这次散步。