下面，我分析几个句子，跟网友的类似。最后一句，as soon as possible 是约定俗成的固定搭配，不必分析，会用即可。as...as 中间的soon，可以使用不同的形容词或副词：

as soon as possible

as early as possible

as much as possible

as little as possible

as fast as possible

......

网友的问题，可参考以下分析：

Don’t give children more money than is necessary.

不能说：Don’t give children more money than it is necessary.

这说明：than 是比较代词，它既表示比较的意义，又有指代much money的作用，在从句中作主语。

He often eats more than is good for his health.

不能说：He often eats more than it is good for his health.

这说明：than 是比较代词，它既表示比较的意义，又有指代much money的作用，在从句中作主语。

More people hope to live in the countryside than used to (do).

不能说：More people hope to live in the countryside than they used to (do).

这说明：than 是比较代词，它既表示比较的意义，又有指代many people的作用，在从句中作主语。

更多例句：

He never says more than is necessary.

他从不多说没有必要的话。（他从不说废话）

He often eats more than is good for his health.

他常常吃的饭量多于对身体有益的量。

The family spent more than is prudent or necessary.

该家庭花钱过多，超过了必要的限度。

It is not wise to be wiser than is necessary.

聪明过了头，就是不聪明。

The man drank a little more than was good for him.

那个人酒喝得过了量。

Always do more than is required of you.

凡事永远要超要求完成。

He offered more information than is needed.

他提供了多余的信息。