状语从句在复合句中作状语。根据句子的含义，它可表示时间、地点、
who, whoever, no matter which, though 引导的从句既可倒
让步状语从句可和 yet 连用，但不可和 but 连用。
原因、目的、结果、条件、方式、比较、让步等。状语从句的关键是
掌握不同状语从句的常用连接词和一些特殊的连接词。
各种状语从句分类及其连词一览表
种类 连接词 注意
when, whenever, while, as, before, after, 主句表示将来意义时，从until, till, as soon as, hardly...when, no 句须用一般现在时；whilesooner...than, the moment, the minute, 引导的的从句动词一般是
时间状语 immediately, directly, instantly 延续性动词；until 用在肯
定句中主句动词是延续性
的，而否定句中主句动词
是短暂性的。
地点状语 where, wherever
because, as, since, now that because 语气最强，since 原因状语 较弱，表示大家都明了的
原因，as 又次之
if, unless, once, in case, as long as, on 从句中动词时态不可用将 条件状语 condition that 来时，常用一般现在时替
代
结果状语 so...that, such...that
目的状语 so that, in order that, for fear that, lest so that 和 in order that
后常接 may, should,
could, would 等情态动词。for fear that/lest 后的从句一般用虚拟语气，谓语 动词用 should +v
than, as...as, not so/as...as, the more...the 比较状语 more
方式状语 as if, as though, as as if 和 as though 引导的
从句一般用虚拟语气
though, although, even if, even though, as 在让步状语从句中常as, no matter what, whatever, no matter 用倒装形式；掌握不同状语从句的常用连接词和一些特殊的连接词。
各种状语从句分类及其连词一览表
种类 连接词 注意
when, whenever, while, as, before, after, 主句表示将来意义时，从until, till, as soon as, hardly...when, no 句须用一般现在时；whilesooner...than, the moment, the minute, 引导的的从句动词一般是
时间状语 immediately, directly, instantly 延续性动词；until 用在肯
定句中主句动词是延续性
的，而否定句中主句动词
是短暂性的。
地点状语 where, wherever
because, as, since, now that because 语气最强，since 原因状语 较弱，表示大家都明了的
原因，as 又次之
if, unless, once, in case, as long as, on 从句中动词时态不可用将 条件状语 condition that 来时，常用一般现在时替
代
结果状语 so...that, such...that
目的状语 so that, in order that, for fear that, lest so that 和 in order that
后常接 may, should,
could, would 等情态动词。for fear that/lest 后的从句一般用虚拟语气，谓语 动词用 should +v
than, as...as, not so/as...as, the more...the 比较状语 more
方式状语 as if, as though, as as if 和 as though 引导的
从句一般用虚拟语气
who, whoever, no matter which, though 引导的从句既可倒
| 让步状语 | whichever, no matter how, however, no matter when, whenever |
装也可不倒装； although 引导的从句用 正常语序。 |
