what引导什么从句做主语

　　What in the world did they think they were doing?

　　他们到底认为自己在做什么？

　　Things ain't what they used to be.

　　现在情况不比从前了。

　　Call it what you will, it's still a problem.

　　不管怎么说，这仍然是个问题。

　　What do you charge for this type of work?

　　这种活你收多少钱？

　　What do you charge for work of this type?

　　这种活你收多少钱？