数词考点一:基数词和序数词的写法【经典练****1.—Howlongisthenewbridge?Doyouknow,Jack?—’ -five;;-five;-five;,用括号中所给单词的正确形式填空。(twelve)(five)(y)birthday?(one)’,hewantedtotrya_______(three)【考点点拨】◆基数词个位与十位之间要加连字符,百位与十位(若无十位则与个位)之间常加and。◆序数词first,second,third为特殊形式;一般规律是在基数词词尾加-th,但fifth,eighth,ninth,twelfth应特别注意;整十的序数词要把y变为ie再加-th,如:twenty→twentieth,thirty→thirtieth等;超过20的非整十数,需将个位变为序数词。考点二:分数表达法【经典练****单项选择。’;;;;.—Whichisthesmallestnumberofthefour?—.—Doyouknowwhattwothirdsandfivesixthsis?—Letmesee…it’【考点点拨】英语中表示分数时,分子用基数词,分母用序数词;分子大于1时,分母要在序数词后加-s分数作主语时,谓语动词的单复数取决于分数后所跟的名词的数。考点三:hundred,thousand,million,billion的用法【经典练****单项选择。’’
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