Keys:

1. How the prisoner escaped →subject

2. that the robbery was an inside job → predicate nominative

3. how he could just disappear → direct object

4. that he had escaped → appositive

5. whoever finds the stolen diamonds → indirect object

6. where he might be → object of the preposition

7. That we were ready to go → subject

8. whoever wants to go → indirect object

9. That you are losing ground → subject

10. Whoever injured the handicapped woman → subject Step III:

主语从句

一、由what（whatever，whoever）等代词引导的主语从句。

What they are after is money. 他们追求的是金钱。

Whatever was said here must be kept secret. 这里说的话都应当保密。

二、由连词that引导的主语从句。其中that一般不可省略，但若用it作形式主语， that从句后置时，则可省略。为避免头重脚轻，我们倾向用it开头，后接be，seem等。如果句子是疑问形式，就只能用带it的结构。

That money doesn't grow on trees should be obvious.

金钱不能从树上长出来是显而易见的。

It is obvious（that）money doesn't grow on trees .显而易见，金钱是不能从树上长出来的。

Has it been announced when the planes are to take off？飞机什么时候起飞宣布了没有？

注意：

1）选用what还是用that引导主语从句要根据关联词在从句中是否担任成分而定。且what（以及whatever，whoever等）引导的主语从句一般不用it作形式主语。