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常考基数词、序数词一览表,基数词变序数词口诀： 1，2，3特殊记，结尾各为t，d，d; 加th，4开始； 8少t, 9去e，千万别忘记 (eighth，ninth)； 5和12不规则，f来把ve替 (fifth，twelfth)； 20到90, y结尾变成ie (twentieth)； 若是几十几，前基后序就可以。,考点一 基数词,基数词,(1)基数词表示数量，后面一般接复数名词(“一”除外)，如 seven days。 (2)基数词的读法： 从右向左看，每隔三位划一逗号，倒数第一个逗号之前要用thousand，倒数第二个逗号之前要用million，倒数第三个逗号之前要用billion。例如： 7，258，366，200 可读为： seven billion，two hundred and fiftyeight million，three hundred and sixtysix thousand，two hundred 百位与十位之间要加and，如one hundred and twentyfive; 十位与个位之间要加连词符，如seventyfour。,(3)hundred, thousand, million, billion, dozen前面有具体数字时，后面不加s 和of; 如果没有具体数字， 后面必须加s 和of。如：five hundred(五百), hundreds of(成百上千的), ten thousand(一万), thousands of(成千上万的), millions of(上百万的)。,基数词,(4)时间的读法 顺读法： 点钟分钟。例如： 2：05 two five3：50 three fifty 逆读法： 分钟 30，用“past”：分钟past点钟(几点过几分)。例如： 4：15 four fifteena quarter past four 6：30 half past sixthirty past six 分钟 30分钟，用“to”：分钟(60分钟数)to(点钟1)(几点差几分)。 例如： 7：40 twenty to eight8：45 a quarter to ninefifteen to nine 整点的表达：点钟oclock。例如： 9：00 nine oclock,基数词,(5)编号的表达：名词基数词the序数词名词。例如： Lesson Onethe first lesson (6)小数点用“point”，百分数用“percent”表达。例如： 14 one point four60% sixty percent (7)与表示度量衡单位的词连用。例如： 10米深/长/宽/高 ten meters deep/long/wide/tall,基数词,互动一,()1. _ of volunteers will be needed for 2015 Horticulture Exportion in Qingdao. Lets go and _ them. AThousands; join BThousand; be a member of CThree thousand; take part in DThousands; be in,()2. The chairperson received about three _ applications to join the Bird Watching Club. Ahundred Bhundreds of Chundred of Dhundreds,D,A,考点二 序数词,序数词,(1)序数词表示顺序，前面一般有“the” 或代词修饰，后面一般接名词单数。例如： Monday is the second day of the week. Today is his seventeenth birthday. 注意：a/an序数词表示“又一，再一(表示泛指)”。例如： I have failed twice, but I want to try a third time.,(2)分数的表达：分子用基数词，分母用序数词，分子大于1，分母s。例如： 1/3 one third3/4 three fourths/three quarters (3)日期的表达：英语中日期的表达顺序为月、日、年或日、月、年。如： It happened on January the second，1990.It happened on January 2，1990.,序数词,互动一,D,C,()1.David, how old is your father this year? _. And we just had a special party for his _ birthday last weekend. AFortieth; forty BForty; forty CForty; fortieth DFortieth; fortieth,()2.Its said that _ of the water around the world _ polluted. Atwo third; has Btwo thirds; have Ctwo third; are Dtwo thirds; is,考点三 其他重点表达,其它重点表达,半小时 half an hour 半天 half a day 两天半 two and a half daystwo days and a half 一至两天 one or two daysone day or two 在20世纪90年代 in the 1990s 在他30多岁 in his thirties 再多两天 two more days another two days,
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