初中英語語法：數詞
I基數詞
1.基數詞的構成
(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。
23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one
(3)101—999先說“幾百”，再加and,再加末兩位數或末位數;
586→five hundred and eighty-six,803→eight hundred and three
(4)l,000以上,先從右往左數，每三位數加一個“,”,第一個“,”前為thousand.第二個“,”前為
million,第三個“,”前為billion(美式)或thousand ,million(英式),然后一節一節地表示。
1,001→one thousand and one
9,785→nine thousand, seven hundred and eighty-five
18,423→eighteen thousand, four hundred and twenty-three
6,260,309→six million two hundred and sixty thousand three hundred and nine
750,000,000,000→seven hundred and fifty, billion(美式) seven hundred and fifty thousand million(英式)
1.2.基數詞的用法
(1)作主語
eg.Four Of them come from Paris.
(2)作賓語
eg.一 How many books would you like?
一I would like two.
(3)作表語
eg.Seven minus two is five.
(4)作定語
eg.There are three people in my family•
(5)作同位語
eg. You two will go swimming with us.
(6)表具體數字時,hundred, thousand ,million用單數。
eg. There are six hundred students in our grade.
(7)表不確定的數字時,數詞用復數。若帶名詞，再加of。 hundreds of(數百,成百上千的),thousands of(數干,成千上萬的),millions of(數百萬)two thousand (兩千)
Thousands and thousands of people have visited the city.成千上萬的人參觀了這座城市。
(8)在一些表示“一排”或“一組”的詞組里;
eg,They arrived in two sand threes.他們三三兩兩地來了。
(9)表示“…十”的數詞的復數可以表示人的歲數或年代。
eg. He is in his early thirties.他有三十來歲(31—34歲)：
This took place in the 1930s.這事發生在二十世紀三十年代;
(10)表示時刻
鐘點表達法。
順讀法(鐘點+分鐘) 如：4:30 four thirty 4:45 four forty-five 4:15 four fifteen 倒讀法(分鐘+to/past+鐘點)
如：4:30 half past four
4:15 fifteen past four/a quarter past four 4:45 fifteen to five/a quarter to five
eg.I watch CCTV News at seven o’clock every evening.
(11)表示百分數
百分數的表達方式是：基數詞+ percent(單數形式)+of+名詞。如：
Thirty percent of the students in my class are from cities. 我班30%的學生來自城市。
About 61 percent of the surface is covered by water. 大約61%的表面被水覆蓋著。
(12)小數的讀法：小數點讀作"point"，小數后各位數要分別讀， 小數點前的數若為"0"可略去不讀。
Examples： 2.468 讀作：two point four six eight
0.157 讀作：(zero)point one five seven
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