上篇文章我们谈到了名词性从句分为四类：
宾语从句、表语从句、主语从句、同位语从句。并且重点讨论了宾语从句。今天我们将剩余的三种进行探讨。
二、表语从句：
1、表语从句的含义：作表语的句子，放在系动词后面。
例句：The clear message is that we should get moving to protect ourselves.
整个句子为一个主句，其中is后面的为表语从句（用that连接词连接）。
2、表语从句的写法：同宾语从句，但是连接词that不能省略。
主句里面用连接词将一陈述句（从句）连接。其中的陈述句为表语从句。
例句：Part of the problem is that the justices are not bound by an ethics code.
is 系动词后面用that连接词连接一个陈述句（表语从句）。
This is where developing new habits comes in.
is 系动词后面用where连接词连接一个陈述句（构成表语从句）。
3、表语从句的位置
应该在主系表句型中，并且位于系动词后面。
例如：For Williams , these activities become what he calls "electronic morphine."
become系动词后面用what连接词连接一陈述句（即表语从句）。
Yet the fact remains that the merger movement must be watched.
其中remains为系动词，后面用that连接词连接一陈述句（即表语从句）。
注意：可能有非谓语系动词+标语从句（重要性不高）
例如：Human nature being what it is,most people stick with default settings.
being为非谓语系动词，后面用what连接词连接表语从句。
The explanation for insensitivity to smell seems to be that the brain finds it inefficient to keep all smell receptors working all the time but can create new receptors if necessary.
to be 为非谓语系动词，后面用连接词that连接表语从句。
三、主语从句：
1、主语从句的含义：用一个句子作主语。
2、主语从句的写法：同宾语从句的写法同，但是连接词that不能省略，还要注意：whether与if的选择只能选择whether，不能用if。
例如：That the seas are being overfished has been known for years.
That the seas are being overfished为主语从句，其中that不能省略。
What motivated him ... was his zeal for "fundamental fairness"
What motivated him是主语从句，且是特殊疑问句作从句，故用连接词What.
And whether the community"s work contributes much to an overall accumulation of knowledge is doubtful.
whether the community"s work contributes much to an overall accumulation of knowledge为主语从句，是一般疑问句作的从句，作选择时只能用whether。（一定要注意哦！！）
3、主语从句的位置：有两种：（1）一般放在句首，但是不一定就在开头。所谓的句首指的是放在谓语动词的前面。
例如：What is needed is a technology of behavior...
What is needed主语从句放谓语前面。
（2）可以后置，用形式主语放谓语动词前面，将实际主语从句后置在后面。（这个是最最最重要的形式，小伙伴们请引起十二分的注意哈。）
It did not matter what was done in the experiment;...
It占位，what was done in the experiment主语从句放谓语动词后面，后置。
It is becoming less clear , however ,that such a theory would be a simplification,...
It占位，that such a theory would be a simplification主语从句放谓语动词后面，后置。
注意：在写作中也常常用哦。
模板一：It is done + 主语从句（表达人们对一件事的观点看法）符合英语的形式：事情被认为...
This year, it was proposed that the system be changed:...
it was proposed（It is done）that the system be changed主语从句（用that连接词连接）
It was argued at the end of the 19th century that humans do not cry because they are sad ...
It was argued（It is done）that humans do not cry because they are sad主语从句（用连接词that连接）
模板二：It is + adj./n. + 主语从句（表达对一件事的评价）
例如：... it is obvious that their views were less fully intellectualized.
it is obvious（It is + adj.） that their views were less fully intellectualized主语从句（用that连接词连接）
Second, it is surely a good thing that the money and attention come to science rather than go elsewhere.
it is surely a good thing（It is + n.）that the money and attention come to science rather than go elsewhere主语从句（用that连接词连接）
四、同位语从句：
1、同位语从句的含义：一个句子作同位语，解释说明名词。
例如：Writing in the last year of his life,he expressed the opinion that in two or three respects his mind had changed during the preceding twenty or thirty years.
opinion名词，用that in two or three respects his mind had changed during the preceding twenty or thirty years来解释说明它。
2、同位语从句的写法：同宾语从句。n. + (连接词 +陈述句)这部分就是同位语从句了。
最常用的一种是that连接的。基本是陈述句变化过来。注意：that不作成分，但也不能省略。
例如：Evidence that the LoveLife program produces lasting changes is limited and mixed.
Evidence名词, that the LoveLife program produces lasting change解释说明它。
A century ago,Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears;...
theory名词，that dreams were the disguised shadows of our unconscious desires and fears;同位语从句解释说明前面的名词。
3、同位语从句的位置：放在抽象名词的后面。注意哦，是抽象名词。
因为只有抽象名词才需要解释，什么是抽象名词呢？一个名词不能完全表达清楚意思即为抽象名词。
例如：idea , opinion , fact , evidence , question , doubt , reason , theory , belief , possibility , chance , hope , contention , guarantee ...（最近几年试题中出现过的）
例句:Part of the fame of Allen"s book is its contention that "Circumstances do not make a person , they reveal him ."
contention抽象名词， that "Circumstances do not make a person , they reveal him同位语从句解释说明它。
Most theories of juvenile delinquency have focused on children from disadvantaged families , ignoring the fact that children from wealthy homes also commit crimes.
fact（事实）抽象名词，是什么样的事实呢？后面用that children from wealthy homes also commit crimes同位语从句解释说明它。
注意：四种名词性从句写法基本相同：连接词+陈述句，但是位置不同。
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