二、使用虚拟语气的表语从句

在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用“should+动词原形” 表示，should可省略。常见的词有：advice, suggestion, order, proposal, plan, idea等。

My suggestion is that we (should) start early tomorrow.

我的建议是我们明天一早就出发。

三、语序及连词that的省略问题

表语从句一定要用陈述语序。

False: The question is when can he arrive at the hotel.

Right: The question is when he can arrive at the hotel.

引导表语从句的that通常不省略。

My idea is that we should do it right away. 我的意见是我们应该马上干。

The trouble is that he is ill. 糟糕的是他病了。

四、表语从句的基本用法

1. 表语从句只能置于主句之后，而主句的动词只能是连系动词。例如：

The problem is how we can get the things we need. 问题是我们怎样能弄到我们需要的东西。(how 在表语从句中充当方式状语)

The scissors are not what I need. 这把剪刀不是我所需要的。(what在表语从句中充当宾语)

What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。(what在主语从句中作直接宾语，that作为表语从句的引导词在该表语从句中不充当句子成分，不能省略)

That is what I want to tell you. 那就是我想要对你讲的。(what在表语从句中充当直接宾语)

That is why she failed to pass the exam. 那就是她考试不及格的原因。(why在表语从句中充当原因状语)

2. 下面是两个与“That is why...”形式相似的结构，它们与“That is why...”结构之间的关系要能够辨析清楚：

(1)“That is why...”与“That is the reason why...”同义，只不过从语法结构上讲，“That is the reason why...”中why引导的是—个定语从句，将其中的the reason去掉则与“That is why...”结构一样，例如：

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

(2)“That is because...”句型中从属连词because引导的名词性从句在此作表语，这也是个常用句型，意为“这就是为什么……/因为……”。“That is because...”与“That is why...”之间的不同在于“That is because...”指原因或理由，“That is why...”则指由于各种原因所造成的后果，例如：

He did not see the film last night. That is because he had to help his little sister with her homework. 昨天晚上他没有去看电影，那是因为他得帮助他的妹妹做作业。(第一句话说明结果，第二句话说明原因)

He had seen the film before. That is why he did not see it last night. 他以前曾看过那部电影，因此他昨天晚上没有去看。(第一句话说明原因，第二句话说明结果)

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