状语从句_状语从句解析
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Clauses of Condition, Conceion and Contrast(条件、让步和对比从句)条件从句
由 if, unle, as(so)long as, provided / providing(that), suppose / supposing(that), in case等引导，如：
If he comes I'll tell you.You would have succeeded if you had tried harder.You will fail unle you work hard.(=You will fail if you don't work hard.)
Supposing / Suppose it rains, shall we have the match as scheduled?
In case you need anything else, please let me know.让步从句
由 although, though, even though, even if, whether...or, while, as, wh-words + ever(= no matter + wh-words)等从属连词引导，如：
He is quite modest though he is the best student in the cla.The needle has the same ma whether it is hot or cold.Whichever(No matter which)plan you adopt, you will meet with difficulties.使用上述让步从句的某些从属连词时注意以下几点：
a.although(though)不可与连词 but 连用；
b.as 引导的从句意义和 though 相似，但表示的语气较强，并须将强调的词放在句首（但不用 although），如：
Simple as(though)the question may seem, it is not at all common in nature.c.however / no matter how 引导的从句中，however / no matter how 后须紧跟形容词或副词，如：
However / No matter how hard I tried, I couldn't remember all the questions.对比从句
表示两个人或两件事之间的对比，常用 while 或 whereas 引导，如：
He is idle, while his brother is diligent.Some people like fat meat, whereas others hate it.Clauses of Cause, Result and Purpose(原因、结果和目的从句)原因从句
主要由下列从属连词引导：
1． Because, as, since。其中 because 语气最强，表示直接、主要原因，通常引导的从句放在句尾，特别是回答 why 提出的问题只能用 because;as 和 since 表示明显的、已知的原因，since 比 as 正式，如：
They had to move because their building was to be pulled down.As Mary was the eldest, she looked after the others.Since they live near the sea, they often go sailing.2． now that, seeing(that), considering(that), in that。这些连词与 as, since 意思相近，通常用于书面语，并且它们兼有其它意义。now that 有“时间”含义，表示”既然”，说明一种新
情况；seeing(that)和 considering(that)有“条件”含义；in that 有”某一方面”含义，如：
Now that you are well again you can travel.Seeing(that)they are just beginners, they are doing quite a good job.I was lucky in that I was able to find a good baby-sitter（保姆）.结果从句
常用 so that, so...that, such...that, that 等连词引导，如：
I was caught in a shower, so that all my clothes got wet.I was so tired that I could hardly keep my eyes open.He was such a good runner that I couldn't catch him.目的从句
常用 so that, in order(that), lest, for fear that 等连词引导，如：
I took a taxi so that I could be in time for the meeting.Come closer in order that you may see the blackboard better.so that 既可引导结果从句也可引导目的从句，但结果从句表示事实，通常不含情态动词；目的从句表示希望或想要实现的事实，通常含有情态动词，如：
He got up early so that he caught the train.（结果）
He got up early so that he could(might)catch the train.（目的）
Lest 和 for fear(that)含有否定意义，并且从句中动词须用 “动词原形”或 ”should + V.” 的虚拟语气，如：
He ran away lest he(should)be caught.(= He ran away in order that he would not be caught.)
I checked all the results time and again for fear that there should be any mistakes.(= I checked all the results time and again so that there wouldn't be any mistakes.)
Clauses of Manner and Comparison(方式和比较从句)方式从句
主要由 just as, as, as if, as though 等连词引导，如：
He doesn't speak the way as other people do.Our bodies are made up of millions of very small cells, just as a building is made of many stones or bricks.He speaks French as if(as though)he were a Frenchman.由 as if 或 as though 引导的从句通常用虚拟语气，但如果主句谓语是感官动词，并且所述情况实现可能性大，也可用陈述语气，如：
It looks as if the coming autumn harvest will be even better than the last one.比较从句
主要由 as...as, not so(as)...as, than 等连词引导，如：
This table is as wide as that one.Mary can not run so(as)fast as Tom.Silver conducts electricity better than other metals.Clauses of Proportion and Other Types(比例从句和其它从句)比例从句
由关联词 the...the...连接形容词或副词比较级构成，如：
The more she thought about it, the more she liked it.其它从句
如 as...so 和 what...that 引导的类比从句；so(as)far as 引导的范围从句；except that 引导的例外从句；rather / sooner than 和 would / had rather than 引导的择比从句等，如：
As the desert is like a sea, so is the camel like a ship.（沙漠似海，骆驼似舟。）
What blood veel is to a man's body, that railway is to transportation.（铁路对于运输，好比血管对于人的身体。）
As(So)far as I know, he is an honest man.（据我所知，他是一个诚实的人。）
I would do it with pleasure, except that I am too busy.（要不是我太忙了，我会很高兴去做的。）
Rather than get money in such a dishonest way, he would beg in the streets.（他宁可沿街乞讨，也不愿意用欺骗手段骗取钱。）
He would rather have the small one than the large one.（他宁可要那个小的，而不愿要那个大的。）
