Unit 7 Unit 7 How much are these pants?How much are these pants?Section B Period 2 Section B Period 2one twothreefourfivesixseven eight nineteneleven twelvethirteenfourteenfifteensixteenseventeen eighteennineteen twentytwenty-onetwenty-twotwenty-threetwenty-fourtwenty-fivetwenty-sixtwenty-seven twenty-eighttwenty-ninethirty-onethirty1、数字、数字1-12是没有规律的；是没有规律的；2、13-19都是以都是以teen结尾；结尾；3、21-29都是在都是在 twenty-后加个位数后加个位数4、20、30直到直到90都是以都是以 ty 结尾结尾10 11 12 13 14 1516 17 18 19 20 2122 23 24 25 26 2728 29 3
