在復合句中，位于系動詞之后作表語的從句叫表語從句。引導表語從句的關聯詞與引導主語從句的關聯詞大致一樣，表語從句位于系動詞后，有時用as if引導。

其基本結構為：主語+ 聯系動詞+ that從句

1.that 引導表語從句，無詞義，只起連接作用，不可省。

2.聯系動詞可為be,look,seem,sound,appear等。

3.主語可為名詞fact,truth,cause,question,explanation,trouble,assumption,belief等，代詞this,that,these,it等。

The fact is that we have lost the game. 事實是我們已經輸了這場比賽。

That’s just what I want. 這正是我想要的。

This is where our problem lies. 這就是我們的問題所在。

That is why he didn’t come to the meeting. 那就是他為什么不到會的原因。

It looks as if it is going to rain. 看上去天要下雨了。

Raw material is what we are badly in need of.原材料是我們所急需的。

China is not what it used to be.中國已不是過去的中國了。

【注意】

1.當主語是reason時，表語從句要用that引導而不是because。

The reason why he was late was that he missed the train by one minute this morning.

2.whether可引導表語從句，但與之同義的if卻通常不用于引導表語從句。

3.That is why…譯為“這就是……的原因/因此”。

其中why引導的名詞性從句在句中做表語，該句型通常用于針對前面已經說過的原因進行總結。

That is why you see this woman before you know.這就是現在這位女士出現在你面前的原因。

That is why I came.這就是我來的原因。

區別：

①That is why ……與That is the reason why …同義，只不過從語法結構上講，前者中的why引導表語從句，后者中的why引導定語從句。

That is (the reason ) why I cannot agree.這就是我不能同意的理由。

②That is because …句型中從屬連詞because引導的名詞性從句在此做表語，意為“這就是為什么……/因為……”。

That is because …指原因或理由。

That is why … 指由于各種原因所造成的后果。

He didn not see the film last night. That is because he had to help his little sister with her homework.昨晚他沒有去看電影，那是因為他得幫助他的妹妹做作業。（第一句話說明結果，第二句話說明原因）

He had seen the film before. That is why he did not see it last night.他以前曾看過那部電影，因此他昨晚沒有去看。（第一句話說明原因，第二句話說明結果）

在復合句中，位于系動詞之后作表語的從句叫表語從句。引導表語從句的關聯詞與引導主語從句的關聯詞大致一樣，表語從句位于系動詞后，有時用as if引導。

其基本結構為：主語+ 聯系動詞+ that從句

1.that 引導表語從句，無詞義，只起連接作用，不可省。

2.聯系動詞可為be,look,seem,sound,appear等。

3.主語可為名詞fact,truth,cause,question,explanation,trouble,assumption,belief等，代詞this,that,these,it等。

The fact is that we have lost the game. 事實是我們已經輸了這場比賽。

That’s just what I want. 這正是我想要的。

This is where our problem lies. 這就是我們的問題所在。

That is why he didn’t come to the meeting. 那就是他為什么不到會的原因。

It looks as if it is going to rain. 看上去天要下雨了。

Raw material is what we are badly in need of.原材料是我們所急需的。

China is not what it used to be.中國已不是過去的中國了。

【注意】

1.當主語是reason時，表語從句要用that引導而不是because。

The reason why he was late was that he missed the train by one minute this morning.

2.whether可引導表語從句，但與之同義的if卻通常不用于引導表語從句。

3.That is why…譯為“這就是……的原因/因此”。

其中why引導的名詞性從句在句中做表語，該句型通常用于針對前面已經說過的原因進行總結。

That is why you see this woman before you know.這就是現在這位女士出現在你面前的原因。

That is why I came.這就是我來的原因。

區別：①That is why ……與That is the reason why …同義，只不過從語法結構上講，前者中的why引導表語從句，后者中的why引導定語從句。

That is (the reason ) why I cannot agree.這就是我不能同意的理由。

②That is because …句型中從屬連詞because引導的名詞性從句在此做表語，意為“這就是為什么……/因為……”。

That is because …指原因或理由。

That is why … 指由于各種原因所造成的后果。

He didn not see the film last night. That is because he had to help his little sister with her homework.昨晚他沒有去看電影，那是因為他得幫助他的妹妹做作業。（第一句話說明結果，第二句話說明原因）

He had seen the film before. That is why he did not see it last night.他以前曾看過那部電影，因此他昨晚沒有去看。（第一句話說明原因，第二句話說明結果）