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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