序数词:表示顺序的数词叫序数词。
1.英语的序数词基本变法:
一般在基数词后加th
-ve结尾的改为-fth
-ty结尾的改为-tieth
熟记特殊词
2.注:两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词。如:thirty-sixth,
使用序数词时一般加定冠词the. 如:Im in the third grade.
序数词作几分之几讲时,有复数形式。如:1/5one fifth ; 2/3 two thirds ; 4/7 four sevenths ; 1/2 a half ; 1/4a quarter ; 3/4 three quarters ; 50% fifty hundredths .
数词的用法:
1.表示年份:2002: twenty thousand and two ; 1976 : nineteen seventy-six.
2.表示日期: 12月1日: Dec.1st或the first of December;2002年11月8日: Nov. 8th, 2002.
3.表示时刻: 5:15 five fifteen或a quarter past five ; 8:30 eight thirty或half past eight ; 10:45 ten forty-five或a quarter to eleven.
4.表示编号:Room 105Room one 0 five; Bus No.13Bus Number Thirteen; P.5Page Five; Tel.No.7658659Telephone Number seven-six-five-eight-six-five-nine
5.小数的读法:5.7 five point seven, 0.16 zero point one six.
6.半的表达: 1/2half, 半小时half an hour, 1.5小时one and a half hours或one hour and a half.
7.序数词前面加the时,表示顺序,加a/an时表示再一、又一。如:The third lesson is rather difficult./ Shall we read the text a third time?
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