从属连词，又称从属连接词，是连接从句与主句的词语，它不仅起到连接作用，还能表明从句与主句之间的关系。从属连词的种类繁多，包括时间、原因、条件、结果、目的、让步、比较、假设等关系。
1. 时间从属连词：when、while、as、before、after、since、until、as soon as、the moment、every time等。
2. 原因从属连词：because、because of、since、as、now that、in that等。
3. 条件从属连词：if、unless、supposing、on condition that、provided that等。
4. 结果从属连词：so that、in order that、so...that、such...that等。
5. 目的从属连词：in order that、so that、that等。
6. 让步从属连词：although、though、even though、even if、while、whereas、though等。
7. 比较从属连词：than、as...as、not as...as等。
8. 假设从属连词：if、supposing、in case等。
熟练掌握从属连词的使用，对于提高英语写作和阅读能力具有重要意义。以下是一些关于从属连词的例句：
1. 时间：When I arrived at the airport, the plane had already taken off.
2. 原因：Because it was raining, we had to cancel the picnic.
3. 条件：If you study hard, you will pass the exam.
4. 结果：He was so tired that he fell asleep on the bus.
5. 目的：She bought a new car in order to drive to work more comfortably.
6. 让步：Although he was tired, he kept working until midnight.
7. 比较：She is as tall as her sister, but she is not as pretty.
8. 假设：If I had known about the test, I would have studied harder.
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