1. 英语中的关系词，指的就是定语从句中的连接主句和从句的中间的那个代词或副词，具体相关的定义如下：
复合句中，用一个句子作定语修饰某一名词或代词，有时也可以用来修饰一个名词性短语，也可以修饰一个句子，这样的从句叫定语从句(attributive clause)。定语从句修饰的词叫做先行词或中心词(antecedent)；连接定语从句的词叫关系词(relative)。先行词与关系词之间实质上是互等关系。也就是说，关系词的作用就是将先行词所表达的意义代到从句中来起作用。定语从句必须放在先行词/中心词之后，而引导定语从句的词有关系代词：as, that, which, who, whom, whose(特殊句式中but, than也作关系代词)和关系副词：when,where, why等。
This is the house where/in which we lived last year.这就是我们去年住的房子。
I still remember the day when/on which I first came to Beijing.我仍记得第一次去北京的那一天。
His parents wouldn't let him marry anyone whose family was poor.他父母不让他和家庭困难的人结婚。
Finally, the thief handed everything (that) he had stolen to thepolice.最后，那个小偷向警察交出他偷的所有的东西。
In the dark street, there wasn't a single person to whom she could turnfor help.在那个黑暗的街道上，没有她可以求助的人。
In 1519 another traveler who went to America from Europe discoveredthe tomato.1519年另一位从欧洲去美洲的旅行家发现了西红柿。
2. 从属从句的概念就比较广了，名词性从句的主语从句、表语从句、宾语从句、同位语从句；起副词作用的状语从句；起定语作用的定语从句。这些都是从属从句。
引导主语从句的关联词有三类：
(1) 从属连词that，放于句首，不可省略，用形式主语it的主语从句中口语中可以省略that。
That they were in truth sisters was clearfrom the facial resemblance between them.很明显，她们确是亲姐妹，她们的脸型很相似。
→It was clear from the facial resemblance between them (that) theywere in truth sisters.
(2) 从属连词whether(不可以用if)表示“是否”。
Whether he'll come here isn't clear.他是否会来这里还不清楚。
(3) 连接代词what, whatever, which, whichever, who, whom, whoever, whose等。
(4) 连接副词how,when, where, why等。
Whoever comes is welcome.不论谁来都欢迎。
What she did is not yet known.她干了什么尚不清楚。
How this happened is not clear to anyone.这事怎样发生的，谁也不清楚。
Wherever you are is my home - my only home.你所在的任何地方就是我的家—我唯一的家。
3. 状语从句根据它们的含义分为时间、地点、原因、目的、结果、方式、让步、条件、比较(也叫程度)等九种。状语从句连词有：
① 时间(time): after, as,as soon as, before, every(each) time, hardly(scarcely)…when,immediately, no sooner…than, once, since, the day, the minute, the moment, the second,till, until, when, whenever等。
② 地点(place):everywhere, where, wherever等。
③条件(condition): as/so long as, if, if only, in case, on condition that,only if, providing/provided that, suppose/supposing that, unless等。
④原因(cause): as, because, considering that, in that, in view of the factthat(鉴于), now that, seeing that, since等。
⑤让步(concession): though, although, as, despite the fact that, evenif(though), for all that, granting/granted, however, in spite of the fact that,no matter + wh-, whatever, wherever, whether…or, while, whoever等。
⑥比较/程度(compare/degree): as…as, not so…as, not the same as, than等。
⑦方式(manner): as, as if(though), the way等。
⑧目的(purpose): for fear that, in order that, in case, lest, so that,that等。
⑨结果(result): but that, so that, so…that, such…that等。
连接词不一样
对等从句 使用对等连接词 如 or and but therefore等
例句 you may vote for me or vote for nobody
从属从句 用的是从属连词 when, as, while等
例句 As I looked, someone came near
ew word came and left our brains for several times. Nobody is born as genius for s
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