序数词的用法总结

1、序数词的用法总结 以下是为大家的序数词的用法总结，希望能帮助大家更好地认识序数词，提高水平。 1. 序数词前要加定冠词the, 通常放在名词前面作定语。例如: the second lesson is more difficult than the first. 第2课比第1课要难。 2. 给东西或各种物体编号时,序号在前时用序数词,序号在后时用基数词。例如: the fifth lesson, lesson five, no. 14 middle school 3. 序数词前面加不定冠词a/an, 表示“再一”、“又一”的意思。例如: try it a second time. 请再试一次。

2、 he cast it a third time, and drew in a lot of stones. 他又撒了第三次网,拉上来许多石头。 1. one 2. two 3. three 4. four 5. five 6. eight 7. nine 8. ten 9. twelve 10. twenty 11. thirty-one 12. sixty-five key: 1. first2. second3. third4. fourth5. fifth6. eighth7. ninth 8. tenth9. twelfth10. twentieth11. thirty-first1

3、2. sixty-fifth 1. 一般在相应的基数词后面加词尾-th。 例如: fourfourth, sixsixth, sevenseventh, tententh, eleveneleventh, thirteenthirteenth 注意下面的一些特殊变化: onefirst, twosecond, threethird, fivefifth, twelvetwelfth,eighteighth, nineninth 2. 表示“几十几”或“几百零几”的基数词变为序数词时,只将个位数变为序数词,十位数或百位数不变。例如: twenty-onetwenty-first, thirty-

4、threethirty-third, forty-fourforty-fourth 3. 以-ty结尾的基数词变为序数词时,应先将y改为i, 再加-eth。 例如: twentytwentieth, thirtythirtieth, fortyfortieth, fiftyfiftieth, sixtysixtieth, seventyseventieth, eightyeightieth, niyniieth 4. 序数词的缩略式一般由阿拉伯数字加上序数词的最后两个字母构成。例如: first1st, second2nd, third3rd, fourth4th, twelfth12th, twenty-first21st 基变序,有规律, first, second, third要牢记; 其余变化有规律,基数词尾加-th; eight去t、 nine去e后加-th。 从twenty, thirty到niy, 需先变y为ie, 再加-th