1、名词性从句 主语从句 宾语从句 同位语从句
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 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 It + v + (that +SVO)=n.
强调句 It is/was + A + that + B
而且通常情况下 It is/was……是强调句
The fact, that the ancestors of birds are dinosaurs, is known.
The fact, that the sun is round.
The book, that you bought for me. “that”充当宾语。
It is generally accepted that the single super continent known as Pangaea indeed existed, that Pangaea subsequently broke apart into two giant pieces, Gondwanaland in the south and Laurasia in the north, and that the continents attached to the various crustal plates separated and drifted in various directions.
人们普遍接受，Pangaea 以一个特别大的陆地形式存在，后来他被分为两个大块，在南边的Gondwanaland 和在北边的Laurasia，他和那些在不同地壳上的大陆分开了并且向不同方向上漂移。
This is pig that/which is very fat.
This is the pig that/which I ate.(作宾语可省略引)
This is the pig from which I make fun.
This is the pig,which is very fast
This is the pig, (which)I ate.
This is the pig, from which I make fun.
The book, whose cover is red, is quite interesting.
This is the place where(=in which 定语从句) I grew up. When 用在后面也可能是状从,也有可能是定从。
In his hypothesis that he developed based on it……
看上去该句的based 是一个n-ed的形式，但是她又是修饰谁呢?In his hypothesis() he developed that based on it….
因此可以看出，based 修饰that，而在此句中，that指代 hypothesis.
This is the pig that/which I ate.
This is the pig I ate.
The house, which was built in 1919,was destroyed.
The house, built in 1919,was destroyed.
As the plates drifted, they may have diverged, which(指代前面一句话) was associated with the spread of the seafloor, or they may have converged, which(指代前面一句话) resulted in collision, subduction, and mountain building.
主系表结构 变成 表系主 结构成为系表倒装只限于介词词组在句首时
1、My hometown lies in Jilin province.
In Jilin province lies my hometown.
2、A,B,C….are among the species of seabirds.
Among the species of seabird are A,B,C….
When he was young, Jack was always beaten by his father.
省略的条件 s’=S v’=be
省略 When young, Jack was always beaten by his father.
省略 Other(联系同一类的名词，也就是说前面提到了chemical defenses) possible chemical defenses, while (they are 省略) not directly toxic to the parasite, may inhibit some essential step in the establishment of a parasitic relationship. For example, glycolproteins in plant cell walls may inactivate enzymes the degrade cell walls.