通过一些简单的例子，我们可以让同学们更明白托福阅读文章中的一些从句关系，使得备考更高效。
Therefore，if the Earth began as a superheated sphere in space, all the rocks making up its crust may well have been igneous and thus the ancestors of all other rocks.
(特殊结构may well have been——可能是)
因此，如果地球开始时是太空中一个过热的球体，那么所有组成地壳的岩石都可能是火成的，因此成为所有其他岩石的祖先。
解析：
主句：all the rocks may well have been igneous and thus the ancestors of all other rocks
从句1：if the Earth began as a superheated sphere in space
从句2：making up its crust
主句中两个宾语部分igneous和the ancestors of all other rocks并列
从句1作为条件状语从句，修饰主句
从句2非谓语动词后置修饰主句中的主语rocks
名词性从句 主语从句 宾语从句 同位语从句
引导词 (what/how/that/why/whether)
结构 主语从句
what+VO=n. for eg
what+SV=n. What you said is right.
形式宾语 Make it possible for sb.to do ?
that/how/why/whether+SVO=n.
That the ancestors of birds are dinosaurs is known.It is known that the ancestors of birds are dinosaurs.(形式主语居多)
形式主语和强调句的区别
形式主语 It + v + (that +SVO)=n.
n.=it
强调句 It is/was + A + that + B
SVO=A+B
而且通常情况下 It is/was……是强调句
同位语从句
同位语的实质 n1,n2—n1=n2
S,n,VO.=S,引+svo,VO
前面的成分不应当在后面充当成分。
The fact, that the ancestors of birds are dinosaurs, is known.
可接同位语的名词多为抽象名词，例如：view/idea/suggestion/fact/reason/conclusion……
同位语和定语从句的区别
同位语的句子中，前面的成分不应当在后面充当成分。
The fact, that the sun is round.
定语从句中，引导词充当成分。
The book, that you bought for me. “that”充当宾语。
以上就是关于托福阅读中各种从句的举例分析，希望对大家备考托福阅读有所帮助。
