2017年成人高考专升本英语复习资料-词汇：数词2

5.基数词可以和其他词一起构成合成形容词，在句子中作定语。

　　A one-month-old baby can recognize its mother by smell.

　　This eleven-month-old baby can speak a few words.

　　(The baby is eleven months old.)

　　The teacher asked us to write a four-thousand-word essay as our homework.

　　(There are four thousand words in the essay.)

二、序数词及其主要用法

　　表示顺序的词称为序数词。如first， second， third， fourth， ninth， twenty-first， forty-fifth等。

　　序数词可以用来表示日期和世纪。May the first / the first of May (5.1) ， August the eighth / the eighth of August (8.8) ， the twentieth century， the twenty-first century

　　序数词在句子中前面一般加the

　　The first of October is our National Day.

　　She was the third to arrive.

　　序数词在句子中前面加不定冠词，表示“再一”又一“。

　　They'll have to do it a second time.

　　Shall I ask him a third time?

　　When he sat down ， a fourth man rose to ask.