在学完定语从句之后,同学们会接触到的另一个语法项目是数词。表示数目、多少和顺序先后的词叫数词。数词有两种:表示数目多少的数词叫基数词,如:one,ten twenty-three;表示顺序先后的数词叫序数词,如:first,third,twentieth。
1.基数词
基数词相当于名词,在句中可做主语、表语、定语、状语等。如:
Three of my classmates are from Shanghai.
I am twenty this year.
They have four classes in the morning and three in the afternoon.
2.序数词
1)序数词的构成:
★大多数的序数词是由基数词加-th构成。如:seven―seventh;ten―tenth
★以-t结尾的基数词只在词尾加-h。如:eight―eighth
★以-ve结尾的基数词改-ve为f再加-th。如:five―fifth;twelve―twelfth
★以-y结尾的基数词改-y为-ie再加-th。如:twenty―twentieth,thirty―thirtieth
★几十几的序数词只在个位数体现。如:twenty-one―twenty-first;thirty-three―thirty-third
★特殊的序数词:
one―first;two―second;three―third; nine―ninth
2)序数词在句中同样可做主语、表语、定语、状语等。如:
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