1. 在句子中起表語(yǔ)作用的從句叫做表語(yǔ)從句。表語(yǔ)從句的引導(dǎo)詞和主語(yǔ)從句的引導(dǎo)詞相同。

What the police want to know is when you entered the room.

警察想知道的是你什么時(shí)候進(jìn)的房間。

The trouble is that we are short of funds. 困難是我們?nèi)狈Y金。

That’s why I want you to work there. 那就是我要你在那兒工作的原因。

His first question was whether Mr. Smith had arrived yet.

他的第一個(gè)問題是史密斯先生到了沒有。

as if, as though, because也可用來引導(dǎo)表語(yǔ)從句。

She seems as if she had done a great thing. 她看起來好像做了一件大事。

It is because you eat too much. 那是因?yàn)槟愠缘锰嗔恕?/p>

2. 虛擬語(yǔ)氣：表語(yǔ)從句

主語(yǔ)是idea, notion, proposal, suggestion, request等名詞時(shí), 作表語(yǔ)從句的動(dòng)詞為原形動(dòng)詞或should+原形動(dòng)詞。

My suggestion is that we (should) go and help him. 我的建議是我們應(yīng)該去幫助他。

Our only request is that this should be settled as soon as possible.

我們唯一的請(qǐng)求就是盡快解決這個(gè)問題。