名词性从句
　　名词性从句包括主语从句、表语从句、宾语从句和同位语从句。
　　※ 区分同位语从句和定语从句。
　　The news ____a theme park will be set up here is true.
A. that B. which C of which D. /
　　定语从句是修饰、说明名词或代词 ( 先行词 ) 的，而同位语从句则是揭示该名词具体内容的。所以，从某种程度上说，名词和同位语从句之间可以划等号。但要切记 which 不能引导同位语从句。
　　※that 与what 引导主语从句时的区别：
　　It worried her a bit ______ her hair was turning grey .
　　A . while B . if C . that D . for
　　______ is a fact that English is being accepted as an international language .
　　A . There B . This C . That D . It。
　　 that 在名词性从句中不充当任何成份，也无词义，仅起连接作用。引导并列的宾语从句时，第二个 that 以及引导主语从句、同位语从句时，不可省略。that 从句作主语时，常用句型结构为：It is ( was ) + adj . 或n . + that 从句:
It is impossible that he has enrolled at the university.
It is a fact that he was forced to attend the evening class.
在 The reason for . . . ( Why . . . ) is that . . . 结构中的 that 不可用 because 替代。
The reason for his illness is that he was caught in the rain last night.
The reason why he was ill is that he was caught in the rain last night.
　** 　______ you have done might do harm to other people . 　　 A . That B . What C . Which D . This
　** 　______ he said at the meeting astonished everybody present .
A . What B . That C . The fact D . The matter　**　______ we can't get seems better than ______ we have .
A . What ; what B . What ; that
C . That ; that D . That ; what　　
what 本身在名词性从句中充当一定的成份，或主语、或宾语、或表语。这时 what 具有两种含义：保留疑问的意义，即“什么，什么样的”；相当于“先行词 + 定语从句”结构的用法，“the thing／fact／matter that . . . ”常译为“所……的 ( 东西或事情 ) ”。区分用 that 还是 what 的依据是看从句中有没有主语、表语或从句的及物动词带不带宾语，若带有宾语，则用 that ; 若无宾语，则用 what。
　　※ whether 和 if 两个连词的不同用法。
　　______ the 2000 Olympic Games will be held in Beijing is not known yet .
　　A . Whenever B . if C . Whether D . That
　　______ we'll go camping tomorrow depends on the weather .
　　A . If B .Whether C . That D . Where
　　　whether 和 if 意为“是否”，虽不充当句子成份，但也不可省略。两词在动词后引导宾语从句时，常可互换。但在下列情况下，名词性从句引导词用 whether 而不用 if。从句作介词宾语时，后面紧接 or not 时。主语从句或宾语从句置于句首时。引导表语从句、同位语从句时。动词 discuss 后的宾语从句中。由 if 引导宾语从句可能产生歧义时。动词 doubt 用在疑问句或否定句中时，宾语从句的连接词用 that 而不能用 whether 或 if ; doubt 用在肯定句中时，则用 whether 或 if 均可，但不能用 that。
I don’t doubt that you will succeed.
I doubt whether(if) he has told the truth.
　　※选用正确的连接代词 what , who ( m ) , whose , which , 和连接副词 when , where , why , how。
　　Go and get your coat . It's ______ you left it .
　　A . where B . there C . there where D . where there　　　
I remember ______ this used to be a quiet village .
　　A . when B . how C . where D . what。
　　— Do you remember ______ he came?
　　— Yes , I do , he came by car .
　　A . where B . how C . that D . if。
　　 连接代词 what , whom , who , whose , which 都保留各自的疑问含义，既起连接作用，又在句中充当一定的成份。连接副词 when , where , why , how 等，也是既有疑问含义，又起连接作用，同时又在从句中充当各种状语，分别表示时间、地点、方式、原因等。
　　※what 与 whatever ; who 与 whoever 的不同用法。
　　______ leaves the room last ought to turn off the lights .
　　A . Anyone B . Person C . Whoever D . Who
　　Sarah hopes to become a friend of ______ shares her interests .　　
A . anyone B . whomever
C . whoever D . no matter who
　　It's generally considered unwise to give a child ______ he or she wants .
　　A . however B . whatever C . whichever D . whenever
　　 whoever 为连接代词，意为“凡……者”，相当于 anyone ( 或 any person ) who + 定语从句。whoever 既作主句的主语，又作从句的主语；而 who 引导的主语从句，只表示“谁”，在从句中作主　语。 what 与 whatever , when 与 whenever , where 与 wherever 的含义基本相同，只是后者比前者语气更重。在意义上也有细微差别：
　　what 与 whatever ( whatever 含义为 anything that ) ;
　　when 与 whenever ( whenever 含义为 any time when ) ;
　　where 与 wherever ( wherever 含义为 any place where ) 。
　　※名词性从句要用陈述语序。
　　They want to know ______ do to help us .
　　A . what can they B . what they can
C . how they can D . how can they　
　
No one can be sure ______ in a million years .
　　A . what man will look like B . what will man look like
　　
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