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卫生类职称英语考试语法(18)

2015-03-03 16:26 来源:医学教育网

卫生类职称英语考试语法:

基数词表示数目的词称为基数词。其形式如下:

A.从1——10

one,two,three,four,five,six,seven,eight,nine,ten.

B.从 11——19

eleven,twelve, thirteen, fourteen, fifteen, sixteen, seventeen,eighteen, nineteen.

C.从 21——99

除twenty,thirty,forty,fifty,eighty为特殊形式外,sixty,seventy,ninety都是其个位数形式后添加后缀-ty构成。

21 twenty-one

76 seventy-six

D.百位数

个数基数词形式加“hundred”,表示几百,在几十几与百位间加上and.

101 a hundred and one

320 three hundred and twenty

648 six hundred and forty-eight

E.千位数以上

从数字的右端向左端数起,每三位数加一个逗号“,”。从右开始,第一个“,”前的数字后添加 thousand,第二个“,”前面的数字后添加 million,第三个“,”前的数字后添加 billion。然后一节一节分别表示,两个逗号之间最大的数为百位数形式。

2,648 two thousand six,hundred and forty-eight

16,250,064 sixteen million,two hundred and fifty thousand and sixty-four

5,237,166,234 five billion,two hundred and thirty-seven million,one hundred and sixty-six thousand,two hundred and thirty-four

F.基数词在表示确切的数字时,不能使用百、千、百万、十亿的复数形式;但当基数词表示不确切数字,如成百、成千上万、三三两两时,基数词则以复数形式出现。

There are hundreds of people in the hall.

Thousands and thousands of people come to visit the Museum of Qin Terra-Cotta Warriors and Horses every day.

They went to the theatre in twos and threes.

G.表示人的不确切岁数或年代,用几十的复数形式表示。

He became a professor in his thirties.

She died of lung cancer in forties.

It was in the 1960s.

H.基数词的句法功能

基数词在句中可作主语、宾语、定语、表语、同位语。

The two happily opened the box.

I need three altogether.

Four students are playing volleyball outside.

We are sixteen.

They three tried to finish the task before sunset.

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