prep2 49 it在比较句中！（非that）

shiwen66666

that/ this/ those /these等不能单独出现做主语

比较中多见的that of等 大多也都是指代之前出现的宾语结构。

-- by 会员 keaneice (2009/11/21 11:47:12)

不一定吧？能举个例子吗？

wj1304

it指代清晰无误, it前只有一个单数名词, 并且是主句主语.

这句的比较对象是increase的幅度, 是动词. 不是比名词.

sayysong

Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture to 1950.
Since 1990 the global economy has grown more than that did during the 10,000 years from the beginning of agriculture to 1950.

如果真要出现that单独指代的话，我认为也没错，只不过有it的情况下，it指代胜于that，认为it更合适。

-- by 会员 sayysong (2009/11/21 12:46:05)

that单独出现的我还没有见到过。。

-- by 会员 shiwen66666 (2009/11/21 13:31:18)

LZM的9-18
Wind resistance created by opening windows while driving results in a fule penalty at least as great as that incurred by using air conditioning.

Taken

it指代global economy

10000年前的global economy和一万后的global economy是同一个东西

而that/those用在类似于A of B is more than that of C

首先B和C不是同一个东西，比如B是美国人，C是欧洲人。其次A和that指不同东西的共有属性，比如工资，美国人有，欧洲人也有

chenche8827

后面三个选项错误太多了，首先since 1990，最好用完成时态；其次，后面的现在完成时必须改成过去完成时。最后it本身就指growth of economy，那么what又指什么呢？

-- by 会员 Kisadida (2009/11/21 12:29:21)

嗯，顶。what可以把DE去掉，CB是因为that你指代什么呢？是economy还是growth？另外C在Manhattan论坛上，说明了单用which的定语从句必须用，隔开，除非前面加了介词。不加逗号必须用that作为限定性定语从句的。B中的has been more than 这里more没有修饰的词，你可以说growth has been slowed 但是你不能说has been more。more的后面没有加一个adv来修饰不知道比较的到底是什么，是快了？慢了？