基数词
l 读法：101 a hundred and one; 320 three hundred and twenty; 648 six hundred and forty-eight 2,648 two thousand,six hundred and forty-eight; 3,008 three thousand and eight; 16,250,064 sixteen million,two hundred and fifty thousand,sixty four; 5,237,166,234 five billion,two hundred and thirty-seven million,one hundred and sixty-six thousand,two hundred and thirty-four 特别注意：hundred，thousand，million表示确切数量时，其前一般有a或基数词，用单数形式，且不能与of连用，如two thousand people“2千人”； 如不表示确切数量时，要用复数形式，且与of连用，如 thousands of people“数千人”； 也可被several，a few等词修饰，如 three thousand years，a few hundred books
l 句法功能：名词/形容词作用，句中作主语，宾语，表语 ，定语，同位语。
Three from eight leaves five八减三等于五(主语，宾语) / My phone number is 1345xxxxx(作表语) /We still have one hour left(定语) / We two will help you(同位语)
序数词：
l 句法功能：句中作主语，表语，宾语，定语等
The first is mine and the second is yours(主语) / You are the second to come(表语) / Do you prefer the first or the second?(宾语) / The second Sunday of May is Mother’s Day(定语)
数词的用法：编号可用序数词或基数词表示，序数词在名词前并加定冠词，基数词在名词后且名词首字母要大写，如基数词用单词表示也要大写首字母，一般基数词教常见，常用阿拉伯数字。
l 表达编号：
100号房间：Room 100，Room No.100或the No.100 Room
10路公交车：Bus 10，Bus No.10或the No.10 Bus
中山东路10号: No.10 East Zhongshan Road
第8号: Number 8(NO.8)
第10页: Page 10或the 10th page
电话号码086-136-1184：Tel.No. 086-136-9184,读作telephone number zero，eight，six（dash,)one,three,six(dash,)one,one,eight,four-----电话号码种的0也可读作/əʊ/，双数11也可读作double one,dash也可稍停顿不读出。
l 表达日期年代：
1997年：nineteen ninety-seven=1997
2009年10月25日：October the twenty-fifth,two thansand and nine = October 25(th),2009/25(th) October 2009
20世纪90年代：the nineteen nineties = the 1990s/the 1990’s
表达年龄：
She is a student,16,from China / I’m sixteen years old / He began to learn Chinese at the age of sixteen
When he was in his sixteen,he became a very famous poet / 在16岁时: at sixteen,at age sixteen / 一个16岁的女孩: a girl who is sixteen, a girl who is sixteen years old, a girl aged sixteen, a sixteen-year-old girl, a girl of sixteen
l 表达时刻：小于10可用o，15用quarter，对半half或直拼，大与30差用to
It's seven o’clock. / It’s seven / 7:30=seven thirty或half past seven / 7:58= seven fifty-eight 或two to eight /7:05= seven o five / 7:10= ten past seven/ 7:15= fifteen past seven或a quarter past seven / 7:45=fifteen to eight或a quarter to eight 注意am/pm不能和morning/afternoon同时用
l 表达钱数：
货币符号留2位: $7.50不能用$ 7.5 / five hundred dollars=500美元 / a half dollar = 0.5美元 /$ 50 million或50 million dollars
l 表达分数/小数/百分数：
1/2 = one half或a half不能读one second
1/3 = one third或a third
2/3 = two thirds
3/4 = three fourths或three quarters
67.89 = sixty seven point eight nine或six seven point eight nine
0.05 = zero point zero five或point zero five(point表“点”）
3.5% = three point five percent(percent表”百分之”)
46% = forty-six percent
1.5小时=one and a half hours 或an/one hour and a half
2.5千克= two and a half kilos或two kilos and a half
l 表达算式：
5 6=11：读Five plus six is/are/make/makes eleven
11-5=6：读Eleven minus five is/makes six
5*6=30：读Five times/multiplied six is/are/make/makes thirty
30÷5=6：读hirty divided by five is/makes six或Five into thirty is/makes six
l 表达倍数：
We have produced three times as many computers as we did last year.
China is almost five times the size/weight/height/depth/width/age/length of Mexico in area
The length of the road is twice/double what is was three years ago
I am twice older than you
He has read three times more books than i have
The line is longer than that one by twice
I usually spend half what i earn on books
We increased 20% as many products as last year
l 数词-可数名词单数(-形容词)做定语：
a three-month-old baby/a two-month visit to China/a two-week trip around China
序数词前不用the或省略the的情况：为避免重复，参照后续第4季 冠词篇
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