使用than，是对应比较级more 的，than 是比较代词引导比较从句，它本身在从句中作主语。

大道理不用讲太多。给你更多例句，仔细体会：

Don’t give children more money than is necessary.

不要给孩子过多的钱。

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。（他经常吃得过多对他的健康有害。）

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。