题目内容：

Compared with life on Earth,life on Mars will be better in many ways.
为什么开头要用compared,而不用原型（祈使句）或ing形式（动名词作主语）?

优质解答

因为是we compare life on Earth with that on Mars,所以Life on Earth is compared with that on Mars
注意动词和主语关系就行了