一状语从句高考的考查特点。
1. 试题的设问呈现出交叉和综合的特点。
不同性质的连词； 定语从句和名词性从句的干扰)
2. 题干句的情景化增强，句意理解难度提高。
二能力要求：
1.了解状语从句的分类情况及各种状语。
从句中经常使用的连词。
2.能够在真实的语境中判定从句与主句。
的逻辑关系，从而能够使用恰当的连。
词完成交际。
3.能够辨别同类状语从句中近似连词的用法区别。
三状语从句的定义、功能、分类。
定义：在复合句中作状语的从句。
功能：状语从句在主从复合句中修饰主句中的动词，形容词或副词，或整个主句。
分类：按意义可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等状语从句。
从句的位置放在句首，也可放在句末。放在句首时，从句后面常用一个逗号，放在句末时，从句前一般不用逗号。
常见考点：
考点。一、主句与从句的时态呼应问题；
考点。二、连接词的选择（注意区别几组连接词：while/as/when引导时间状语从句；because/since/as/for引导原因状语从句；if/unless引导条件状语从句；so…that/such…that引导结果状语从句等）；
考点。三、状语从句与非谓语动词之间的替换；
考点。四、状语从句的倒装结构（hardly/scarcely…when；nosooner…than等）
考点。五、根据从句与主句的逻辑关系选用从属连词；2.根据从属连词的词义。
四、 分类：状语从句按其作用可分为九类。
1．时间状语从句常见的从属连词有：(注意其汉语意义)
when, while, as, before, after, since, until (till) once as soon as, the moment, the minute, immediately, directly, each/every time, the first time, the last time, next time, by the time, whenever等。例如：
every/each time i was in trouble, he would come to my help. i thought her nice and honest the first time i met her.
注意：（1）when, while, as的区别：
1)when引导从句时，主从句的动作有先有后，也可以同时进行，从句的动作可以是持续性的，也可以是短暂的。如：
when i got to the airport, the plane had already taken off. （主先从后）（短暂性）
when i lived there, i used to go to the seaside on sundays. (同时) （持续性）
when the movie ended, the people went back. （从先主后）
2)while侧重主从句动作的对比，且从句的动词必须是持续性的。如：
while we were chatting she was looking at the time table on the wall．
3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。如：
sometimes i watch tv as i am h**ing breakfast．
4）when和while还可以是并列连词，意分别为“就在这时”，“然而”。eg. i was h**ing a rest on the sofa when the telephone rang．
they were surprised that a child should work out the problem while they couldn’t .
注：并列连词when常用与以下句型中：
…was/were doing…when…（正在做…突然） ②was/were about to do…when…（刚要做…突然）
…was/were on the point of doing…when…(刚要做…突然) ④had just done…when….(刚一…就)
hardly/scarcely had…done…when…(刚一…就)
2)before引导从句时，词义非常灵活，注意下列句子中的before的词义：
.before i could get in a word, the tailor had measured me.(还没来得及就) ②we hadn’t run a mile before he felt tired.
(还没…就) ③we had sailed 4 days before we saw land.(…才…) please write it down before you forget it.(趁还…没就)
3)till (until) 和not…till (until)
till (until):主句谓语动词必须是持续性的，意思是“到…为止“如：he remained there till/until she arrived.
not…till (until)…:主句谓语动词必须是短暂性的，意思是“直到…才”如：she won’t go to bed till/until he returns home.
not…until还有强调式和倒装式：
强调句：it is not until he returns home that she will go to bed. 倒装句：
not until he returns home will she go to bed.
4)几个极易混淆的时间状语从句：
it was +时间点+when…（当的时候时间是it was 5 am when we arrived at the village.
it was/will be+时间段+before…(没过…就／过了…才) it was/will be two weeks before we met/meet again.
it is /has been +时间段+since…（自从…以来有it is/has been 3 years since we last met.
突破点：一看be动词的时态，二看时间段还是时间点。
注意：在“it is /has been +时间段+since…”句型中，从句的动词必须是短暂性的，如果是延续性的动词，时间要从从句的动作结束时算起。如：
it is 3 years since i smoked.( 我戒烟有三年了)
2．条件状语从句
常见的从属连词有：if, unless, as/so long as , as/so far as, on condition that , in case(万一) ,the more…, the more…等。如：
as/so far as i can see ( am concerned), it will be impossible for them to finish the task.
the more books you read, the happier you will feel．(前面为从句)
3．原因状语从句常见的从属连词有：because, since, now that , as等。
注意because, since, as的区别：
）why的语气最强，它引导的从句比主句更重要，从句的位置可前可后；例外回答why的问句必须使用because。如：
why were you absent from the meeting yesterday?-because i was ill.
2)since和now that意为“既然”，语气仅次于because,从句的位置一般在前面。since everybody is here, let’s begin our meeting．
3)as的语气比since更弱，意思是“由于”，从句的位置可前可后。如：
as you didn’t turn up at yesterday’s get-together, we missed you very much．
）*for也有“因为”之意，但for是并列连词常用来来补充说明原因或用来表示推断的依据，前面常带逗号。如：
it must h**e rained last night, for the ground is wet．
4．让步状语从句常见的从属连词有：though, although, as, even if / though, no matter wh-， wh-ever, whether…or…等。
如：however late/no matter how late he is, his family will wait for him to h**e dinner together.
child as he is, he knows a lot. (as引导的让步状语从句必须倒装)
whether it is fine or not, i will go boating．
5．地点状语从句常见的从属连词有：*where, wherever等。 如：put the book where it is．
6．比较状语从句常见的从属连词有：*as…as, *not so (as)…as, *than等。
注意：(1)在表达倍数时，可用三种句型：
1)a…＋倍数＋比较级＋than b 如：this building is twice taller than that one．
2)a…＋倍数＋as原级as＋b 如：this building is three times as tall as that one．
3)a…＋倍数＋the size(height, weight, length etc．) of b 如：this building is three times the size of that one．
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