上篇文章我們談到了名詞性從句分為四類：
賓語從句、表語從句、主語從句、同位語從句。並且重點討論了賓語從句。今天我們將剩餘的三種進行探討。
二、表語從句：
1、表語從句的含義：作表語的句子，放在系動詞後面。
例句：The clear message is that we should get moving to protect ourselves.
整個句子為一個主句，其中is後面的為表語從句（用that連接詞連接）。
2、表語從句的寫法：同賓語從句，但是連接詞that不能省略。
主句裡面用連接詞將一陳述句（從句）連接。其中的陳述句為表語從句。
例句：Part of the problem is that the justices are not bound by an ethics code.
is 系動詞後面用that連接詞連接一個陳述句（表語從句）。
This is where developing new habits comes in.
is 系動詞後面用where連接詞連接一個陳述句（構成表語從句）。
3、表語從句的位置
應該在主系表句型中，並且位於系動詞後面。
例如：For Williams , these activities become what he calls "electronic morphine."
become系動詞後面用what連接詞連接一陳述句（即表語從句）。
Yet the fact remains that the merger movement must be watched.
其中remains為系動詞，後面用that連接詞連接一陳述句（即表語從句）。
注意：可能有非謂語系動詞+標語從句（重要性不高）
例如：Human nature being what it is,most people stick with default settings.
being為非謂語系動詞，後面用what連接詞連接表語從句。
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 為非謂語系動詞，後面用連接詞that連接表語從句。
三、主語從句：
1、主語從句的含義：用一個句子作主語。
2、主語從句的寫法：同賓語從句的寫法同，但是連接詞that不能省略，還要注意：whether與if的選擇只能選擇whether，不能用if。
例如：That the seas are being overfished has been known for years.
That the seas are being overfished為主語從句，其中that不能省略。
What motivated him ... was his zeal for "fundamental fairness"
What motivated him是主語從句，且是特殊疑問句作從句，故用連接詞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為主語從句，是一般疑問句作的從句，作選擇時只能用whether。（一定要注意哦！！）
3、主語從句的位置：有兩種：（1）一般放在句首，但是不一定就在開頭。所謂的句首指的是放在謂語動詞的前面。
例如：What is needed is a technology of behavior...
What is needed主語從句放謂語前面。
（2）可以後置，用形式主語放謂語動詞前面，將實際主語從句後置在後面。（這個是最最最重要的形式，小夥伴們請引起十二分的注意哈。）
It did not matter what was done in the experiment;...
It佔位，what was done in the experiment主語從句放謂語動詞後面，後置。
It is becoming less clear , however ,that such a theory would be a simplification,...
It佔位，that such a theory would be a simplification主語從句放謂語動詞後面，後置。
注意：在寫作中也常常用哦。
模板一：It is done + 主語從句（表達人們對一件事的觀點看法）符合英語的形式：事情被認為...
This year, it was proposed that the system be changed:...
it was proposed（It is done）that the system be changed主語從句（用that連接詞連接）
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主語從句（用連接詞that連接）
模板二：It is + adj./n. + 主語從句（表達對一件事的評價）
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主語從句（用that連接詞連接）
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主語從句（用that連接詞連接）
四、同位語從句：
1、同位語從句的含義：一個句子作同位語，解釋說明名詞。
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名詞，用that in two or three respects his mind had changed during the preceding twenty or thirty years來解釋說明它。
2、同位語從句的寫法：同賓語從句。n. + (連接詞 +陳述句)這部分就是同位語從句了。
最常用的一種是that連接的。基本是陳述句變化過來。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名詞, that the LoveLife program produces lasting change解釋說明它。
A century ago,Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears;...
theory名詞，that dreams were the disguised shadows of our unconscious desires and fears;同位語從句解釋說明前面的名詞。
3、同位語從句的位置：放在抽象名詞的後面。注意哦，是抽象名詞。
因為只有抽象名詞才需要解釋，什麼是抽象名詞呢？一個名詞不能完全表達清楚意思即為抽象名詞。
例如：idea , opinion , fact , evidence , question , doubt , reason , theory , belief , possibility , chance , hope , contention , guarantee ...（最近幾年試題中出現過的）
例句:Part of the fame of Allen's book is its contention that "Circumstances do not make a person , they reveal him ."
contention抽象名詞， that "Circumstances do not make a person , they reveal him同位語從句解釋說明它。
Most theories of juvenile delinquency have focused on children from disadvantaged families , ignoring the fact that children from wealthy homes also commit crimes.
fact（事實）抽象名詞，是什麼樣的事實呢？後面用that children from wealthy homes also commit crimes同位語從句解釋說明它。
注意：四種名詞性從句寫法基本相同：連接詞+陳述句，但是位置不同。