when compared with the size of the earth the highest mountain does not seem high at all.

来源：百度知道 编辑：UC知道 时间：2024/06/15 14:57:07
去掉when 怎么就不对了呢？

when compared with the size of the earth ,the highest mountain does not seem high at all.
是分句形式的状语从句可以去掉when。
若不是分句，去掉when后，什么句子也不是，语法不通。

这是个复合句

以when作引导词引导分句，去掉就不符合语法

如果想用ed形式的伴随状语前置 后面貌似应该有个逗号，（太久没接触语法的东西 不知道错了没

去掉也可以，不过句子要改成：Comparing with the size of the earth the highest mountain does not seem high at all.

when在句子里作连接词,when compared with the size of the earth是整个句子的状语.去掉when,则句子应为 Compared with the size of the earth , the highest mountain does not seem high at all.