(二)序数词:在英语中表示数目顺序、次序的词称为序数词。
1.序数词的构成:序数词的变化源于基数词,所以要牢记基数词的构成。
口诀:基变序有规律,词尾要加th;
一、二、三特殊记,结尾字母t、d、d;
八去t,九去e,ve要用f替;
几十y结尾,把y改i,th前有个e;
几十几,几百几十几等,只将个位变。
第1到第12:1st first2ndsecond3rd third 4thfourth 5thfifth 6th sixth 7thseventh 8theighth9th ninth 10thtenth 11theleventh 12thtwelfth
第13到第19:13th thirteenth 14thfourteenth 15thfifteenth 16thsisteenth 17thseventeenth 18theighteenth19th nineteenth
第20到第90: 20th twentieth 30ththirtieth 40th fortieth 5othfiftieth
60th sixtieth 70th seventieth80th eightieth 90th ninetieth
第几十几:21sttwenty-first22ndtwenty-second68thsixty-eighth
245th two hundred andforty-fifth
2.序数词的用法
(1)序数词作定语时,一般要与定冠词或物主代词连用。
eg.Tom is their secondson.
He is the first one to comehere.
(2)序数词有时可与不定冠词连用,表示数量上“又—”,“再一”
eg:He tried a second time.他又试了—次。
Shall l ask him a thirdtime?还要我再问他—次吗?我已问了他两次。
(3)序数词的缩写形式为:阿拉伯数字加上这个词的末尾两个字母。
eg:1st2nd,3rd,4th,20th,21st,22nd,23rd
(4)表示年、月、日时,年用基数词,日用序数词。
eg:2005年8月15日
(英)15,8,2005=15th,August,2005;(美)8,15,2005=August 15th,2005