Rather than go on with his work, he went home.

Teachers do much more than impart knowledge.

No one could do other than admire it.

In the course of a day students do far more than just attend class.

这些句子在 than 之后的动词都用原形，为什么要带 to 呢？多一个 to 就是累赘。

1. rather than  是一个常用的固定短语，表示“取舍关系”，rather than 之后的部分为“舍”，表示“对等排除”。意为“而不是”。意思等于 instead of doing。rather than 后面接动词原形时，表示一种意愿；后面接与谓语动词相同的时态时，表示两个动作并列，意为“没有怎样，而是怎样”。对比如下：

Rather than go on with his work, he went home.  他不愿继续工作，因而就回家了。

Rather than went on with his work, he went home.  他没有继续工作，而是回家了。

2. ther than：表示“从...中排除”，意为“除此之外”。常跟否定意义的词语连用，意思是“除了以外没有其他”。

No one could do other than admire it.

除了欣赏羡慕它之外，大家都不能做别的。（只有欣赏羡慕。）

No one could do other than admire it. =

No one could do other things except/but admire it.

3. 第2句和第4句，是一个类型，都是：do + more than + do sth.

把这两个不同的 do 放在more than 前后作比较。很简单，前者do 的范围超过后面do的范围。或者说，前面的do 不仅仅是后面的do。

Teachers do much more than impart knowledge.

教师所做的不仅仅是传授知识。
In the course of a day students do far more than just attend class.
一天当中，学生们所做的不仅仅是上课。