内容正文:
专题05 基数词和序数词
目录
考点聚焦:核心考点聚焦,有的放矢
重点速记:知识点和关键点梳理,查漏补缺
难点强化:难点内容标注与讲解,能力提升
学以致用:真题感知+提升专练,全面突破
核心考点聚焦
基数词的用法
(1)当hundred, thousand, million, billion等和of连用,表示粗略的数目时,须用复数。如hundreds of people数以百计的人;
但如果hundred, thousand, million, billion等词前有具体数词或several时,须用单数six hundred people 600人.
(2)表示“几十年代”或“几十岁”时,用逢十的基数词的复数。如:
in the thirties在30年代 in his fifties在他50多岁时
(3)与基数词合成的复合形容词,其中的名词用单数。如:
a three-month-old baby三个月大的婴儿 a five-year plan一个五年计划
序数词
序数词一般以与之相应的基数词加词尾-th构成,但要注意一些特殊形式。
(一)阿拉伯数字基数词序数词序数词缩略式
1 one first 1st 2 two second 2nd 3 three third 3rd
5 five fifth 5th 8 eight eighth 8th 9 nine ninth 9th
12 twelve twelfth 12th 20 twenty twentieth 20th
21 twenty-one twenty-first 21st 22 twenty-two twenty-second 22nd
23 twenty-three twenty-third 23 rd
阿拉伯数字
1
2
3
4
5
6
7
8
9
基数词
one
two
three
four
five
six
seven
eight
nine
序数词
first
second
third
fourth
fifth
sixth
seventh
eighth
ninth
序数词缩写
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
阿拉伯数字
11
12
13
14
15
16
17
18
19
基数词
eleven
twelve
thirteen
fourteen
fifteen
sixteen
seventeen
eighteen
nineteen
序数词
加th
twelfth
加th, 比如 thirteenth, nineteenth
序数词缩写
11th
12th
13th
14th
15th
16th
17th
18th
19th
阿拉伯数字
10
20
30
40
50
60
70
80
90
基数词
ten
twenty
thirty
forty
fifty
sixty
seventy
eighty
ninety
序数词
tenth
把y变成ie, 加th, 比如 twentieth, fortieth
序数词缩写
10th
20th
30th
40th
50th
60th
70th
80th
90th
个位数是1、2、3的序数词(除了11/12/13), 它们的缩写形式就是特殊的(1st, 2nd, 3rd), 比如21 twenty-first, 22 twenty-second, 23 twenty-third.
基变序,有规律,词尾加上th(fourth, sixth), 一二三特殊例,结尾字母t,d,d(first, second, third), 八去t, 九去e(eighth, ninth), ve要用f替(fifth, twelfth), ty将y改成i, the前面有个e,若要碰到几十几,前用基来后用序。
特别提示
1、以y结尾的基数词构成序数词时,先把y变为ie, 再加-th。
2、几十几及以上的序数词,其中十位数或百位数、千位数等用基数词,只有个位数才用序数词。如: 128th: one hundred and twenty-eighth 752nd: seven hundred and fifty-second
3、hundred, thousand