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初中英語知識點總結(jié)與講解
1.基數(shù)詞的構(gòu)成
(1)1-20
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,
sixteen,seventeen,eighteen,nineteen,twenty
(2)21-99 先說幾十,再說幾,中間加連字符。
23twenty-three,34thirty-four,
(3)101999先說幾百,再加and,再加末兩位數(shù)或末位數(shù);
586five hundred and eighty-six,803eight hundred and three
(4)l,000以上,先從右往左數(shù),每三位數(shù)加一個,,第一個,前為thousand.第二個,前為million,第三個,前為billion,然后一節(jié)一節(jié)地表示。
9,785nine thousand, seven hundred and eighty-five
6,260,309six million two hundred and sixty thousand three hundred and nine
750,000,000,000seven hundred and fifty, billion
2.基數(shù)詞的用法
(1)表示數(shù)量
Eg. 一 How many books would you like?
一I would like two.
(2)表示號碼
eg.My phone number is 6887789.
(3)表示時間
eg.I watch CCTV News at seven oclock every evening.
(4)表示十的數(shù)詞的復(fù)數(shù)可以表示人的歲數(shù)或年代。
eg. He is in his early thirties.他有三十來歲(3134歲):
This took place in the 1930s.這事發(fā)生在二十世紀三十年代;
(5)表具體數(shù)字時,hundred,thousand,million用單數(shù)。
eg. There are six hundred students in our grade.
(6)表不確定的數(shù)字時,數(shù)詞用復(fù)數(shù)。若帶名詞,再加of ,hundreds of(數(shù)百,成百上千 的),thousands of(數(shù)干,成千上萬的),millions of(數(shù)百萬)
eg 。 Hundreds of old people died of cold last winter.
(二)序數(shù)詞在英語中表示順序、次序的詞稱為序數(shù)詞。
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