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[SC总结] Twice 用法

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发表于 2017-12-10 13:23:14 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Twice   只有一个词性 副词
搬运Ron 神
Basically, there are three different kinds of acceptable uses of "twice":
1) twice NOUN/PRONOUN, where the noun or pronoun describes a numerical quantity of something;
2) twice as ADV/ADJ (as)... / twice this/that ADV/ADJ
3) twice by itself, meaning that something has happened two times (e.g., i've been there twice).

X is twice that Y.
1)        "that" is a relative pronoun (e.g., the unemployment rate of Country X is twice that of Country Y)
2)        they're part of independent constructions (e.g., smith has already been advised twice that these actions are foolish)

1)The total money i have is twice that you have.
incorrect -- this "that" is not a relative pronoun such as the one above.
2)The total money i have is twice of what you have. Correct
3)the total money i have is twice of that you have. Correct
4)the total money i have is twice as much as you have. 对
The total money 错
5)the total money i have is double of what you have. Incorrect double 直接用
6)The number of books i have are twice that you have.
Incorrect
7)The number of books i have are twice as many as you have.
"twice as many as ..." is a correct construction.
you can't say "the number is twice as many", though -- that's a redundant construction.
you'd just say "i have twice as many books as you have."
8)the number of books i have are twice of as many as you have.
wrong. can't have "twice of X".

句子
The number of undergraduate degrees in engineering awarded by colleges and universities in the United States more than doubled from 1978 to 1985.

According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, twice the number reported in the 1977 survey.

In the 1980’s the rate of increase of the minority population of the United States was nearly twice what it was in the 1970’s.

Providing initial evidence that airport are a larger source of pollution than they were once believed to be, environmentalists in Chicago report that the total amount of pollutant emitted annually by vehicles at O'Hare International Airport is twice that emitted annually by all motor vehicles in the Chicago metropolitan area.

To meet the rapidly rising market demand for fish and seafood, suppliers are growing fish twice as fast as they grow naturally, cutting their feed allotment by nearly half and raising them on special diets.

Today, because of improvements in agricultural technology, the same amount of acreage produces twice as many apples as it did in 1910.

Rock samples taken from the remains of an asteroid about twice the size of 6-mile-wide asteroid that eradicated the dinosaurs have been dared at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.
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沙发
 楼主| 发表于 2017-12-10 13:24:32 | 只看该作者
楼楼觉得twice就是个副词,所以删不删没关系,删的可以的话,就行。求指教
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