1.water is a substance essential to our life.2.water that is

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/10/04 21:10:53

1.water is a substance essential to our life.2.water that is essential to our life is a subtance.
两个句子都没有错吧?第一句子有点不好理解啊,

其实从实际意义上讲第一个句子才正确,第二个句子从语法角度讲正确但没什么意义
第一个句子是essential to our life作定语修饰substance,前面省略了which is,这个句子是完全正确的,意思是“水是一种对我们生活至关重要的物质”,第二个句子太拗口了,不好,意思是“对我们的生活至关重要的水是一种物质”
再问：为什么可以省略which is ？
再答：定语从句的省略问题，加上它后面是一个定语从句，不加就是短语作后置定语，当主句的主语和从句的主语一致时可以省略引导词和系动词
再问：那如果加上的话先行词岂不是成了substance？
再答：是啊，也就是which啊，这两个词是一样的嘛，呵呵
再问：嗯，谢谢，如果考试写出第二个句子会不会得分？
再答：要是我的话是不给分的，呵呵，这个句子没有实际上的意义

1.water is a substance essential to our life.2.water that is Just as water is essential to life,__love is also important important water is in our life! water is life 急! water is very essential for human beings What is important water is in our life Water is the "life blood" of our earth.It is 定语从句主谓一致Water is the only substance that occurs at ordinary water is very important to our e____. there is a water t____in our school water is very important in our life.改为感叹句（）（）water in our l 意思knowledge is to us what water is to life