句子理解was found embedded rocks formed river deposits that were

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/29 08:53:23

句子理解was found embedded rocks formed river deposits that were 52 million years old
Pakicetus was found embedded in rocks formed from river deposits that were 52 million years old.
句中was found后面直接跟embedded 这样的动词后加1个过去分词的是什么用法?
rocks formed这里的formed是做形容词还是名词还是什么?可以 formed rocks吗?为什么?
river deposits 两个词都是名词吗?这种类型与前面一个形容词后面加一个名词的词组有什么不同?如 potamic deposits、fluvial deposits 或者the deposits of river deposits 加了s,难道它是可数名词?
句中的that 是指什么?也就是说were 52 million years old的主语是什么?

1、find sth. +现在分词、过去分词等,表示发现...处于某种状态.这里面是被动语态,将Pakicetus 提前了
2、formed是动词form的过去分词形式做定语,用来修饰前面的rocks.还有,不可以是formed rocks,因为formed from river deposits 是一起的,是rock的定语,表示从河里形成的.
3、river deposits表示河里的沉积物,两个都是名词.还有,意思和你举例的那些基本上没什么不一样,都表示河里的沉积物.只不过river deposits是名词river做定语了,而potamic 、fluvial 都是形容词,是形容词作定语,the deposits of river是名词所有格形式.
4、名词deposit在表示沉淀物、矿床和堆积、沉淀时,既可以是可数名词,也可作不可数名词.在表示存款、保证金;押金;定金时只能是可数名词.
5、这里的that是定语从句的关系代词, river deposits that were 52 million years old是个由that引导的定语从句,that指代前面的deposits.were 52 million years old是用来修饰deposits的,意思是这个河里沉积物有5200万个年头了

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