much of the carbon in the earth comes from things that once lived地球上大部分碳来自于曾经有生命的东西.
问题描述：
much of the carbon in the earth comes from things that once lived地球上大部分碳来自于曾经有生命的东西.
1：comes可以去掉吗?这里固定搭配?
2：things that once lived可以改成ever living things吗?为什么?
答
comes当然不可省,否则这句话就不是个句子了,comes是谓语,that引导的是定语从句
不可改comes from things that once lived（that引导定从,once lived 相当于一个后置定语）.comes from +ever living things没见过,comes from 应直接加宾语things ,而不是先加前置定语.还有ever后不能加-ing