大学英语六级语法辅导:数词
语法部分
数词
表示数目多少或顺序先后的词叫数词,数词与不定代词相似,用法相当于名词和形容词。数词可分为
两类,第一类是基数词,第二类是序数词。基数词表示数目多少;序数词表示顺序。数词的用法相对来
说不是太难,此处重点说一下常考的同时也是容易出错的倍数、分数、百分数和小数的表示法和用法。
表示法
1. 表示两倍用 twice,表示三以上的倍数用 times。如:
This road is twice as wide as that one. 这条路是那条路的两倍宽。
This swimming pool is three times as large as that one.这个游泳池有那个游泳池三个大。
2. 表示分数时,分子用基数词,分母用序数词。分子是 1 以上,分母须用复数形式。如:
1/3one third1/4one fourth2/3two thirds3/4three fourths
3. 小数点前的基数词读法同基数词,但小数点后则须将数字一一读出。如:
2.36 读作 two point three six 0.02 读作 point naught two
46.945 读作 forty six point nine four five
4. 百分数的表示方法是:数字+per cent,其中的百分号%读作 per cent。如:
6% 读作 six per cent 75% 读作 seventy five per cent
600% 读作 six hundred per cent 1.5% 读作 one point five per cent
用法
1. 主语+谓语++as+ 形容词+as。如:
I can eat three times as much as you. 我的饭量是你的三倍。
2. 主语+谓语++the size of...。如:
This river is one-third the width of that one.这条河的宽度是那条河的三分之一。
3. 主语+谓语++形容词的比较级+ than...。如:
The output of this year is 80 percent higher than that of last year.今年的产量比去年增加了 80%。
4. 还可以用 by+倍数,表示增加多少倍。如:
The population has increased by 200% in the past 25 years.人口在过去的 25 年内增加了 200%。
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