表語從句作為英語中的一項(xiàng)重要從句，其內(nèi)含的語法知識(shí)非常豐富，我們要掌握精髓，避開雷區(qū)，在使用時(shí)要格外注意以下幾點(diǎn)：

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一．reason做主語或主語中包含事件的起因時(shí),后面的表語從句表示原因時(shí)要用that來引導(dǎo),而不用because；why引導(dǎo)主語從句做主語時(shí)，表語從句用that引導(dǎo)，不用because。

The reason is that he got up late.

Why he is late is that he got up late.

that is why/because

(1) That is why ...是常用句型,其中why引導(dǎo)的從句在句中作表語,該句型通常用于針對(duì)前面已經(jīng)說過的原因進(jìn)行總結(jié)。That is the reason why ...與That is why ...是同義的，“這就是……的原因/因此……”，但是從語法結(jié)構(gòu)上講That is the reason why ...中的why引導(dǎo)的是一個(gè)定語從句。

That is why she failed to pass the exam.

那就是她考試不及格的原因。(why 在表語從句中充當(dāng)原因狀語)

That is the reason why she failed to pass the exam.

那就是她考試不及格的原因。(why 在定語從句中充當(dāng)原因狀語)

(2) That is because···句型中從屬連詞because引導(dǎo)的名詞性從句在此作表語，這也是個(gè)常用句型，意為“這就是因?yàn)椤薄?/p>

That is because I got up late.??? 這是因?yàn)槲移鸫策t了。

(3) “That is because...”與“That is why...”之間的不同在于“That is because...”指原因或理由，“That is why...”則指由于各種原因所造成的后果。

I was angry. That was because he didn’t understand me.我生氣是因?yàn)樗焕斫馕摇?表語從句強(qiáng)調(diào)原因)

That’s why he got fired from that firm.那正是他被公司解雇的原因。(表語從句強(qiáng)調(diào)結(jié)果)

三. The reason (why…/for…)is /was that….?? ···的原因是····

The reason for his absence is that he got up late.

The reason why he is absent is that he got up late.

他缺席的原因是他起床遲了。

四. 使用虛擬語氣的表語從句

在表示建議、勸告、命令、計(jì)劃含義的名詞后的表語從句，謂語動(dòng)詞需用“should+動(dòng)詞原形”表示虛擬語氣，should可省略。常見的詞有：advice，suggestion，order，request，proposal，plan，idea等。

My suggestion is that we （should）start early tomorrow.我的建議是我們明天一早就出發(fā)。

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