状语从句指句子用作状语时，起副词作用的句子，可以修饰谓语、非谓语动词、定语、状语或整个句子，可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句，是英语复合句学习的一个重点。
1. 时间状语从句：
常用引导词：when, as, while, as soon as, before, after, since , till, until
特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when instantly
eg.I ran into the classroom as soon as the bell rang.
2. 地点状语从句:
常用引导词：where
特殊引导词：wherever, anywhere, everywhere
eg. Wherever the sea is , you will find seamen.
3. 原因状语从句:
常用引导词：because=in that, since=now that, as, for
特殊引导词：seeing that, now that, in that, considering that, given that
eg. I ‘m late because I didn’t caught the bus.
4. 目的状语从句：
常用引导词：so that, in order that
特殊引导词： for fear that（唯恐/生怕），in the hope that, for the purpose that, to the end that
eg. You should book the hotel in advance so that the travel will be more easy.
5.结果状语从句：
常用引导词：so … that, such … that
特殊引导词：such that, to the degree that, to the extent that, to such a degree that
eg. He is so young that he can’t have meal by himself.
6. 条件状语从句：
常用引导词：if, unless,
特殊引导词：as/so long as（只要）, only if, providing/provided that（倘若）, supposing that（倘若）, in case that（以防）, on condition that
eg. You can go to London as long as you have passport.
7.让步状语从句：
常用引导词：though, although, even if, even though
特殊引导词：as(用在让步状语从句中必须要倒装)，while，no matter …， in spite of the fact that, whatever, whoever, wherever, whenever, however, whichever, as if=as though
eg. Though we are old, we still can do these by ourselves.
8. 比较状语从句：
常用引导词：as(同级比较), than(不同程度的比较)
特殊引导词：the more … the more … ; just as …， so…,no … more than; not A so much as B
eg. She is as pretty as her mother.
9. 方式状语从句：
常用引导词：as, as if, how
特殊引导词：the way
eg. He didn’t so it the way his brother did.
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