3. We can use a noun clause as the predicative of be.

The truth is that it's too foggy for the bus to run that far.

My question is whether Polly can find her way home.

4. We can use a noun clause in apposition to a noun.

She had a feeling that she was being watched.

The news that he couldn't come made us upset.

5. We use that, if/whether or a question word to begin a noun clause.

No one knew if/whether he lost his sight because of an accident.

She couldn't imagine how the blind man had found her.

Do an exercise to see if the students understand.

Step Three: More about usage of noun clauses

1. the order of noun clause

一、名词性从句的语序

(1)名词性从句构成有两种

a. That + 陈述句

e.g. That he is still alive is a wonder.

他还活着，真是奇迹。

b. 疑问词+句子的剩余成分

e.g. This is what we are looking for.

这就是我们所寻找的。

(2) 疑问词引导的名词性从句要求使用陈述句语序，不能用一般疑问句语序。

2. the conjunction

(1) that 和what 的选用

that 和 what 都可引导所有的名词从句。但是，what除起连接作用外，还在名词性从句中充当成分，可做从句的主语、宾语、或表语。而that在名词性从句中不充当任何成分，只起连接作用。

3. the noun clauses beginning with that or if/whether

1) 引导动词的宾语从句时；

2) 在be + adj.之后时；