① 否定词开头；not until ② so 加 adj. 开头； ③ as / though引导的让步状语从句。
特别注意：
Hardly … when … No sooner … than … Child as he is, … Hardly had he got to the station when the train left No sooner had he got to the station than the train left.
• 【2009山东, 32】 • — Shall we have our picnic tomorrow? • — ______it doesn’t rain. • A. Until B. While C. Once D. If • 在条件，时间和让步从句中，用一般现在 时表示一般将来时.
状语从句的倒装
状语从句的时态问题
• 【2012北京】21. —Look at those clouds! • —Don’t worry. ______ it rains, we’ll still have a great time. • A. Even if B. As though • C. In case D. If only
规则：当状语从句的主语和主句的主语一致时，可以省
略状语从句中的主语和系动词be.
• 【2012安徽】30. When for his views about his teaching job, Philip said he • found it very interesting and rewarding. • A. asking B. asked • C. having asked D. to be asked
• 【2012陕西】18. Hot ___ the night air was, we slept deeply cause we were so tired after the long journey. • A. although B. as C. while D. however
• • • • • • • • •
状语从句中从句的省略现象
（1）连词 + 过去分词
Pressure can be increased when needed.
Unless repaired, the washing machine is no use.
（2）连词 +现在分词 Look out while crossing the street. （3）连词 + 形容词 / 其他常见的有 if necessary, if possible,when necessary, if any等。
• (08· 安徽)— Have you got any particular plans for the coming holiday? • — Yes, , I’m going to visit some B. If busy D. If possible homes for the old in the city. • A. If ever • C. If anything
languages.
• Child as he is, he can speak seven foreign
• (2011上海卷) 36. If a lot of people say a film is not good, I won’t bother to see it, or I’ll wait it comes out on DVD. • A. whether B. after • C. though D. until