通過一些簡單的例子，我們可以讓同學(xué)們更明白托福閱讀文章中的一些從句關(guān)系，使得備考更高效。
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.
(特殊結(jié)構(gòu)may well have been——可能是)
因此，如果地球開始時是太空中一個過熱的球體，那么所有組成地殼的巖石都可能是火成的，因此成為所有其他巖石的祖先。
解析：
主句：all the rocks may well have been igneous and thus the ancestors of all other rocks
從句1：if the Earth began as a superheated sphere in space
從句2：making up its crust
主句中兩個賓語部分igneous和the ancestors of all other rocks并列
從句1作為條件狀語從句，修飾主句
從句2非謂語動詞后置修飾主句中的主語rocks
名詞性從句 主語從句 賓語從句 同位語從句
引導(dǎo)詞 (what/how/that/why/whether)
結(jié)構(gòu) 主語從句
what+VO=n. for eg
what+SV=n. What you said is right.
形式賓語 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.(形式主語居多)
形式主語和強調(diào)句的區(qū)別
形式主語 It + v + (that +SVO)=n.
n.=it
強調(diào)句 It is/was + A + that + B
SVO=A+B
而且通常情況下 It is/was……是強調(diào)句
同位語從句
同位語的實質(zhì) n1,n2—n1=n2
S,n,VO.=S,引+svo,VO
前面的成分不應(yīng)當(dāng)在后面充當(dāng)成分。
The fact, that the ancestors of birds are dinosaurs, is known.
可接同位語的名詞多為抽象名詞，例如：view/idea/suggestion/fact/reason/conclusion……
同位語和定語從句的區(qū)別
同位語的句子中，前面的成分不應(yīng)當(dāng)在后面充當(dāng)成分。
The fact, that the sun is round.
定語從句中，引導(dǎo)詞充當(dāng)成分。
The book, that you bought for me. “that”充當(dāng)賓語。
以上就是關(guān)于托福閱讀中各種從句的舉例分析，希望對大家備考托福閱讀有所幫助。