衛(wèi)生類職稱英語考試語法：

基數(shù)詞表示數(shù)目的詞稱為基數(shù)詞。其形式如下：

A.從1——10

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

B.從 11——19

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

C.從 21——99

除twenty，thirty,forty，fifty，eighty為特殊形式外，sixty，seventy，ninety都是其個位數(shù)形式后添加后綴-ty構成。

21 twenty-one

76 seventy-six

D.百位數(shù)

個數(shù)基數(shù)詞形式加“hundred”，表示幾百，在幾十幾與百位間加上and.

101 a hundred and one

320 three hundred and twenty

648 six hundred and forty-eight

E.千位數(shù)以上

從數(shù)字的右端向左端數(shù)起，每三位數(shù)加一個逗號“，”。從右開始，第一個“，”前的數(shù)字后添加 thousand，第二個“，”前面的數(shù)字后添加 million，第三個“，”前的數(shù)字后添加 billion。然后一節(jié)一節(jié)分別表示，兩個逗號之間最大的數(shù)為百位數(shù)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.基數(shù)詞在表示確切的數(shù)字時，不能使用百、千、百萬、十億的復數(shù)形式；但當基數(shù)詞表示不確切數(shù)字，如成百、成千上萬、三三兩兩時，基數(shù)詞則以復數(shù)形式出現(xiàn)。

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.表示人的不確切歲數(shù)或年代，用幾十的復數(shù)形式表示。

He became a professor in his thirties.

She died of lung cancer in forties.

It was in the 1960s.

H.基數(shù)詞的句法功能

基數(shù)詞在句中可作主語、賓語、定語、表語、同位語。

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.