As soon as I got home, it began to rain.
注意：如果hardly, scarcely 或no sooner置于句首，句子必须用倒装结构：
Hardly / Scarcely had I got home when it began to rain.
No sooner had I got home than it began to rain
3. 比较until和till 此两个连词意义相同。肯定形式表示的意思是"做某事直至某时"，动词必须是延续性的。否定形式表达的意思是"直至某时才做某事"。动词为延续性或非延续性都可以。 正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。
肯定句： I slept until midnight. 我一直睡到半夜时醒了。
Wait till I call you. 等着我叫你。
在肯定句中可用before代替 Let's get in the wheat before the sun sets.)
否定句：She didn't arrive until 6 o'clock. 她直到6点才到。
Don't get off the bus until it has stopped. 公共汽车停稳后再下车。
I didn't manage to do it until you had explained how. 直到你教我后，我才会做。
1) Until可用于句首，而till通常不用于句首。
Until you told me, I had heard nothing of what happened. 直到你告诉我以前，出了什么事我一点也不知道。
2) Until when 疑问句中，until要放在句首。
---Until when are you staying? 你呆到什么时候?
--- Until next Monday. 呆到下周一。
(3) Not until …在句首，主句用倒装。
Not until the early years of the 19th century did man know what heat is.直到19 世纪初，人类才知道热能是什么。
Not until I began to work did I realize how much time I had wasted. 直到我开始工作，我才认识到了我已蹉跎了几多岁月。
(4) It is not until… that… 表示强调，“直到。。。才。。。”。
二、地点状语从句, 通常由where, wherever 引导。
Where I live there are plenty of trees. 我住的地方树很多。
Wherever I am I will be thinking of you. 不管我在哪里我都会想到你。
三、条件状语从句： 表条件的状语从句主要连接词有if，whether，as long as (只要)，unless, as/so long as, on condition that ，provided(只要) (that)等。
if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句在虚拟语气中阐述。 另外， unless = if not.
Let's go out for a walk unless you are too tired. == If you are not too tied, let's go out for a walk.
典型例题 :
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A。 句意：除非你立即走，否则你就回迟到的。可转化为 If you dong leave immediately, you will be late. B、D句意不对，or表转折，句子如为 You leave immediately or you will be late.
四、原因状语从句： 原因状语从句可由as，because，since及for引导， 比较：because, since, as和for
1) because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。
I didn't go, because I was afraid.
Since /As the weather is so bad, we have to delay our journey.
2) 由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。
He is absent today, because / for he is ill.
He must be ill, for he is absent today.
五、结果状语从句： 结果状语从句常由so… that 或 such…that引导，掌握这两个句型，首先要了解so 和 such与其后的词的搭配规律。
1. 其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so 是副词，只能修饰形容词或副词。 so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。
so foolish such a fool
so nice a flower such a nice flower
so many / few flowers such nice flowers
so much / little money. such rapid progress
so many people such a lot of people( so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。)
2. so…that与such…that之间的转换
The boy is so young that he can't go to school. ==== He is such a young boy that he can't go to school
六、 目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导，例如：
You must speak louder so that /in order that you can be heard by all.
He wrote the name down for fear that(lest) he should forget it.
Better take more clothes in case the weather is cold.
七、让步状语从句： 让步状语从句通常由(even)though，although，no matter，even if ，however，whatever等词引导
注意：
1 ). 当有though, although时，后面的从句不能有but，但是 though 和yet可连用
Although it's raining, they are still working in the field. 虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very hard. 虽然他很老，但仍然努力地工作。
Though the sore be healed, yet a scar may remain. 伤口虽愈合，但伤疤留下了。 (谚语)
典型例题:
___she is young, she knows quite a lot.
A. When B. However C. Although D. Unless 答案：C。意为虽然她很年轻，却知道许多。
2) as, though 引导的倒装句: as / though引导的让步从句必须表语或状语提前(形容词、副词、分词、实义动词提前)。
Child as /though he was, he knew what was the right thing to do.== Though he was a small child, he knew what was the right thing to do.
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