2023年初中英语数词：序数词“三注意”

序数词“三注意”。

一)序数词的构成及基本用法。注意：序数词一般以与之相应的基数词后加-th 构成，少数几个需特别记忆。为方便大家记忆，请看下面口诀。

基变序，有规律，first, second, third要牢记;

其它变化有公式，基数词尾加-th;

eight去t , nine去e;

从twenty, thirty到ninety, 需变y为ie;

five和twelve, 需将ve变f;

若是遇到“几十几”，只变个位就可以。

另外，注意：序数词前要加定冠词the, 在句中作定语放在所修饰的名词前。如：December is the twelfth month of the year. 十二月是一年中的第12个月。

挑战中考：( )15. Thursday is the _____ day of the week. (five)

( 用所给词的适当形式填空)

( )16. He believed his lucky number was ten, so he decided to live on the ____ floor.

A. lowest B. ten C. tenth

( )17. I have made ____ dumplings. Now I’m making the ___ one.

A. twenty; twentieth-first B. twenty; twenty-first

C. twentieth; twenty-first D. twenty; twenty-one

二)序数词与冠词a/an连用。注意：序数词前加不定冠词a/an, 表示“又一”、“再一”的意思。如：Please try it a second time. 请再试一试。但基数词与more连用，并放在more前，表示“另外有”、“还有”的意思。如：I’ll take one more (=another) pencil. 我还要一支铅笔。We ’ve just started! There were twenty more trees to be planted!我们才刚开始呢!还有20棵树要栽呢!

挑战中考：

( )18.Time is not enough for so much work. ____ people are needed, I think.

A. Other two B. Only two C. Two more D. Two others

( )19. Both of the two rulers are broken. I want to buy a ___ one.

A. three B. third C. forth D. 不填

三)分数的表达法。注意：分数以基数词和序数词合成的。分子用基数表示，分母用序数词表示，分子大于1，分母要用复数(-s)。如：1/3(三分之一) ：one third 2/3 :two thirds

挑战中考：

( )20. This is a big class, and ____ of the students are girls.

A. two third B. second three C. two thirds D. two three

( )21. –What’s one fourth and a half , do you know?

--Yes, it’s ______. )

A. two sixths B. three fourths C. one three D. three sixths

练习参考答案：1.A 2.A 3.D 4.D 5.C 6.D 7.B 8.A 9.A 10.B 11.D 12.D 13.A 14.B 15.fifth 16.C 17.B 18.C 19.B 20.C 21.B

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