状语从句

在句中作状语、修饰主句谓语或整个主句的从句，按意义分为时间、条件、原因、结果、目的、让步、方式、地点等类。

一、核心规则

1. 状语从句由从属连词引导，位置灵活：置于句首时通常用逗号与主句隔开。
2. 主将从现：主句为将来时或含将来意义时，时间状语从句与条件状语从句用一般现在时表将来。
3. 让步状语从句中 although/though 不能与 but 连用；because 不能与 so 连用。
4. 时间状语从句的连词除基本词外，还有表“一…就”的 the moment, immediately, no sooner…than, hardly…when 等。
5. 结果状语从句用 so…that / such…that：so 后接形容词或副词，such 后接名词；much, many, little, few 前只能用 so。
6. 状语从句主语与主句主语一致、且从句谓语含 be 时，可省略“主语 + be”（见 省略句）。
7. 状语从句与定语从句的分界：从句修饰的是主句的某个名词还是整个主句的动作。

二、结构与公式

• 时间：when / while / as / before / after / since / until / as soon as + 从句
• 条件：if / unless / as [so] long as / in case / on condition that + 从句
• 原因：because / since / as / now that + 从句
• 结果：so + adj./adv. + that…；such + (a/an) + n. + that…
• 目的：so that / in order that + 从句（常带 can, could, may, might）
• 让步：although / though / even if / no matter wh- / wh- + ever + 从句
• 方式：as / as if / as though + 从句
• 比较：than / as…as + 从句

三、典型例句

1. We must strike while the iron is hot.（我们要趁热打铁。）
2. I’ll stay at home if it rains tomorrow.（要是明天下雨，我就呆在家里。）
3. He was so angry that he couldn’t speak.（他气得话都说不出来。）
4. Although he is poor, he’s still happy.（虽然他很穷，他仍然很快乐。）
5. Immediately he came I told him the news.（他一来我就把消息告诉了他。）
6. He shut the window with such force that the glass broke.（他关窗子用力很大，结果玻璃震破了。）
7. He opened his mouth as if to speak.（他张开口，好像要说话似的。）— 从句省略主语和 be

四、易错点

1. ✗ Although he is poor, but he is happy. → ✓ Although he is poor, he is happy. 原因：汉语“虽然…但是…”不能直译，两词不并用。
2. ✗ They are so clever children that we all like them. → ✓ They are such clever children that…. 原因：so 后不能接“形容词 + 复数名词”。
3. ✗ I will tell him when he will come. → ✓ I will tell him when he comes. 原因：时间状语从句用现在时表将来。
4. ✗ Because it was raining, so we stayed at home. → ✓ Because it was raining, we stayed at home. 原因：because 与 so 不同时使用。

五、高考考点

1. 语法填空：连词选择（when/while/as、because/since/as、although/though）为主。
2. 单选：so…that 与 such…that、no sooner…than 与 hardly…when 的搭配辨析（见 so…that vs such…that）。
3. 短文改错：although…but、because…so 双连词，以及从句时态误用将来时。
4. 写作升级：用让步与条件状语从句构建论证层次（见 语法在写作中的升级用法）。

六、对比与延伸

• 定语从句、名词性从句——三大从句的分工
• 省略句、倒装句（no sooner 置于句首时倒装）
• 时态一致、一般现在时——时间与条件从句中的“主将从现”
• although vs though vs as、because vs so、so…that vs such…that
• 高考语法高频考点与命题陷阱

七、来源

• 语法体系/英语语法网专栏/状语从句/00124-英语语法详解：时间状语从句（两大条）.md
• 语法体系/英语语法网专栏/状语从句/00125-英语语法详解：条件状语从句（两大条）.md
• 语法体系/英语语法网专栏/状语从句/00127-英语语法详解：结果状语从句（五个方面）.md
• 语法体系/英语语法网专栏/状语从句/00129-英语语法详解：让步状语从句（三大方面）.md
• 语法体系/英语语法网专栏/状语从句/00130-英语方式状语从句的用法及有关说明.md