必威体育精装版2012人教版七年级英语上册第七单元全单元课件112p课件.ppt

twenty twen + ty → thirty thir + ty → 40 forty 50 fifty 60 sixty twenty-one thirty-two sixty-seven * 18年 1. 基数词的表达 1) one到twelve, 拼写和读音无规律可言, 只能逐一记忆。 2) thirteen到nineteen，表示“十几”，在个位数后加后缀-teen，其中要注意thirteen, fifteen和eighteen的拼写。 3) twenty到ninety，表示“几十”，以ty结尾，但需注意twenty, thirty, forty, fifty, eighty的拼写。 4) 21~29 直到91~99，表示“几十几”,用整十位数加个位表示, 中间用连字符“-” 把十位和个位连接起来。 * 18年 Can you count these numbers in English? 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 20 21 22 23 24 25 26 27 28 29 13 30 31 32 33 34 35 36 37 38 39 14 40 41 42 43 44 45 46 47 48 49 15 50 51 52 53 54 55 56 57 58 59 16 60 61 62 63 64 65 66 67 68 69 17 70 71 72 73 74 75 76 77 78 79 18 80 81 82 83 84 85 86 87 88 89 19 90 91 92 93 94 95 96 97 98 99 100 101 * 18年 one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty thirty forty fifty sixty seventy eighty ninety twenty-one … twenty-nine thirty-one … thirty-nine forty-one … forty-nine fifty-one … fifty-nine sixty-one … sixty-nine seventy-one … seventy-nine eighty-one … eighty-nine ninety-one … ninety-nine one hundred one hundred and one Learn these numbers and find out the rules: * 18年 1. 1 - 12: (记住每个单词) 2. 13 - 19: -teen (thir-; fif-; eigh-) 3. 20 - 90: -ty (twen-; thir-; for-; fif-; eigh-) 4. 21 - 99: 十位 个位 5. 100 - 900: 1-9 hundred 6. 101 - 999: ____ hundred and __ __ 个位 十位 __ 个位 * 18年 数字小结： two ---- twelve ---- twenty three --- thirteen --- thirty four --- fourteen --- forty five --- fifteen --- fifty six --- sixteen --- sixty seven --- seventeen --- seventy eight --- eighteen --- eighty nine --- nineteen --- ninety one --