2345678910111213151820213050808690102(1)表示确数时,hundred/thousand/million等数词后不加s:数字+hundred/thousand表示概数时,要用复数形式hundreds/thousands/millionsof...数百、数千、数百万...(2)由“基数词+名词+(形容词)”构成的合成形容词作定语时,其中名词只能用单数。aneight-year-oldboy一个8岁的男孩(3)数词+more=another+数词再,又...Therearetwentymoretreestobeplanted.=Thereare________treestobeplanted.注意以下表达方式Ordinalnumber序数词:11th-eleventh12th-twelfth13th-thirteenth14th-fourteenth15th-fifteenth18th-eighteenth19th-eenth20th-twentieth21st-twenty-first30th-thirtieth…90th-ieth100th-onehundredth101st-onehundredandfirstfirstsecondthirdfourthfiftheighthninth1st-2nd-3rd-4th-5th-8th-9th-基数词变序数词的方法:基变序,有规律,一二三,特殊记,firstsecondthird——要从四加起,fourth…ve要用——代替,fifthtwelfth八加——,九减——,eighthninth19,90不去e,eenth,ieth词尾是y变——,thirtieth,fortieth…然后再加——,几十几,几百几,thirty-first前为——尾用——。onehundredandtwelfth
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