表语从句

A

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.

B

引导名词性从句时if/whether（是否）用法辨析：

if不能引导表语从句，只能用whether 来引导。

引导宾语从句时if/whether可以互换，但介词后面的宾语从句只能用whether来引导。

位于句首的主语从句只能用whether来引导，同位语从句也只能用whether来引导。

False: The question is if the enemy is marching towards us.

Right: The question is whether the enemy is marching towards us.

C

不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。

Right: The question is who will travel with me to Beijing tomorrow.

Right: The question is why he cried yesterday.

D

that在表语从句中不可以省掉。　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。

名词性从句在be等系动词后作表语时被称为表语从句。

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，但不能省略）

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）