主语从句 that, wh~ | 玄数

2018-12-27

SAT

The percent increase from 8 to 14 is equal to the percent decrease from 35 to x. What is the value of x?

A. 7.5
B. 7.75
C. 8.25
D. 8.5
E. 8.75
Answer
E. 从8增加到14的百分比等于从35减少到x的百分比. x的价值是多少?

一、简单句和主语从句的对比

在简单句中,主语可以是名词、代词、数词、动词不定式、动名词,以及单纯名词、动词不定式、动名词的并列;而主语从句就是以一个从句作为句子的“主语”,通过引导词来引导

1.  简单句

Somebody is standing behind the tree.  …………… 某人站在树的后面。(不定代词)
To love and to be loved is the greatest happiness one can get.
爱他人并被他人所爱是人生最大的幸福。 (动词不定式的并列)

2.  主语从句

That    Jack is often late for school makes his teacher so angry.
引导词 (主语 + 系动词 + 表语 + 状语) 谓语 宾语 + 状语
When    he will come back is unknow.
引导词 (主语 + 谓语 + 状语) 系动词 表语

Jack is often late for school 和 he will come back 采用的都是陈述语序。由引导词 that 和when 作引导构成主语从句,再接上谓语、宾语或者系表结构组成一个完整的句子。 that 可省略

二、引导连词

1.  从属连词 that、whether

That Jack is often late for school makes his teacher so angry. … 杰克老是迟到让老师很生气。
Whether he will come is not important. …………… 他来与不来,都不重要。

2.  连接代词 what、 which、 who、 whom、 whose、 whatever、 whichever、 whoever、 whomever

What you have said might hurt his feelings. …………… 你说的话可能会伤他的感情。
Which Lily choose is the right one. …………… 莉莉选择的那个是正确的。
Who(whom) you are waiting for all day has been caught by police.
你整天都在等的那个人已经被警察抓走了。

3.  连接副词 when、 where、 why、 how、how many、 how much

When he will come back is unknow. …………… 他什么时候回来还不知道呢。
Where the earth came from puzzled them.  …………… 地球从哪里来把它们难住了。
Why he has been caught is troubling her all day. …………… 他为什么被抓使她整天很烦恼。
How much money Mary wants amuses us. …………… 玛丽想要多少钱,把我们逗乐了。

4.  it 作形式主语,把主语从句后置:It + be + 名词 / 形容词 / 过去分词 + that从句

Whether he will come is not important. …………… 他来与不来,都不重要。
It is not important that whether he will come.
 
That he cannot come is a pity. …………… 他不能来真可惜了。
It is a pity that he cannot come.

主语从句 that, wh~