4、n is more difficult than the first. 第2课比第1课难得多。 2. 序数词前加不定冠词a或an, 表示“再一”“又一”的意思。例如: Try it a second time. 请再试一试。 He cast it a third time, and drew in a lot of stones. (已撒过两次)他又撒了一次网,拉上来许多石头。 3. 给东西编号时,序号在前用序数词,序号在后用基数词。例如: the Fifth Lesson, Lesson Five No. 14 middle school [跟踪
5、训练]写出下列基数词的相应序数词。 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.fourth 5.fifth6.eighth7.ninth8.tenth9.twelfth10.twentiet