状语从句可分为时间，地点，原因，条件，方式，目的，结果，比较，让步状语从句。 一、时间状语从句 1.引导词： as soon as, when ( as ), since, while, not…until, after, before 2.时态特点：主将从现 (1) I’ll go on with the work when I come back tomorrow. (2) As soon as he finishes the work, he will come to see me. 对比：When he saw nobody in, he returned. I don’t know when he will arrive. 3.一…就： as soon as; hardly/scarcely/rarely… when; no sooner…than; the minute, the moment, the instant; 对比: the day/week/year; the first/last time; any/every/each/next time, all the time; from the time; by the time（主句用完成时态） (1) Immediately he arrived, he started telling us what to do.他一到达就开始告诉我们应做什么. (2) Every time I come, he is reading. 我每次来, 他都在读书. (3) He had hardly entered the hotel when it began to snow. (=Hardly had she entered the hotel...) 我们一到达山顶，就坐下来休息。 4.when: 突然 I was about to go out when the bell rang. 5.while: 而，可是 （表对比） You like sports while I like reading. 6.before: 1) 还没来得及 ： The day began to break before we got to the village. 2）常用句型：It will be (not) + 一段时间 + before It was (not) +一段时间 + before 7.since: 1) 主语 + have done…since + 主语+ did 过去时间点 2）It is ( has been) + 一段时间 + since +主语+ did 二、地点状语从句 引导词：where 或wherever（= no matter where ） You’d better make a mark where you don’t understand. Don’t move her. Leave her where she is. Where there is a will, there is a will. 对比：The detective searched the room carefully where was robbed yesterday. （定语从句） 三、原因状语从句 1.引导词：because, since, as（由于）；now (that) (既然)；in that（由于） 2.because和so 不可连用。 3.because of不可跟从句。 4.It is / was because +从句 + that… 5.for: 主句，for + 从句：for 不可位于句首，从句为补充性解释说明或推测。 The days are short, for it is now December. It’s morning now, for the birds are singing. 四、目的和结果状语从句 1.引导词：in order that; so that; for fear that; in case; lest 2.so that不可位于句首，in order that可位于句首。 The box is so heavy that nobody can move it. 3.so many (much, few, little) + 名词 4.so + adj. + a (an) + 名词 + that 5. such a (an) + (adj.) + 名词 + that 6.for fear that; in case; lest引导得目的主语从句常用虚拟语气。 五、条件状语从句 1.引导词：if; suppose, supposing (that); provided; providing (that); on condition that; unless; so (或) long as; in case（万一） 2.时态特点：主将从现 You will miss the train if you don’t hurry. 对比：You would miss the train if you didn’t hurry. I wonder if you will come tomorrow. 六、让步状语从句 1.引导词：though; although; as; even if; even though; no matter + wh-; wh- +ever; 2. although与though不能与but连用，但可以与yet连用。 Although they are poor,(yet)they are warm-hearted. 3. as引导让步状语从句,要用倒装。 (1) Child as (though) he is, he knows a lot. (2) Much as I like it, I won’t buy. 对比：though可以作副词，位于句中或句尾。“可是，不过，然而” (1) It’s hard work; I enjoy it though. 这是件苦活，不过我倒很乐意干。 (2) He’s a bad manager. There’s no reason, though, to dismiss him. 他是个差劲得经理，然而没有理由就此把他免职。 七、方式状语从句 引导词：as, as if (though) （1）I’ll do as I am told to. （2.）It looks as if it is going to rain. 八、比较状语从句 1.引导词：as...as, than, not as/so...as 2.比较从句部分常是省略句 （1）I’m taller than he (is). （2）Science is not as popular as English. 九、省略现象（紧缩的状语从句） 引导词+（主语 / it + be）+ 表语 （1）连接词 + 过去分词 Don’t speak until spoken to. (=…until you are spoken to) Once seen, it can never be forgotten. (=Once it is seen…) （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it necessary、if possible、when necessary、if any等。 I prefer my milk a little sweetened whenever possible. (=…whenever it is possible) While in Beijing, I paid a visited to the Summer Palace. (=while I was in Beijing…)