小学英语中的基数词和序数词

小学英语中的基数词和序数词

在小学四年级英语中接触到了基数词和序数词~下面是我对基数词和序

数词的一些总结和介绍~希望能对大家的学习产生帮助。

基数词

基数词的定义

表示数目的词是基数词。

基数词的构成

最基本的数词如下:

1 one,

2 two,

3 three,

4 four,

5 five,

6 six,

7 seven,

8 eight, 9

nine, 10 ten, 11 eleven, 12 twelve, 13 thirteen, 14 fourteen, 15 fifteen,

16 sixteen, 17 seventeen, 18 eighteen, 19 nineteen, 20 twenty, 30 thirty,

40 forty, 50 fifty, 60 sixty, 70 seventy, 80 eighty, 90 ninety, 100

a hundred, 1,000 a thousand, 1,000,000 a million, 1,000,000,000 a billion.

基数词 1-12 是独立单词,需逐个记忆。基数词13 - 19是个位数词的词干后加-teen 构成。其中thirteen, fifteen, eighteen变化不规则。基数词20—90是在十位数词后面加-ty 构成。基数词21—99是在十位数词后面加上个位数词合成,中间加上连字符“ –” 。例如:

21 twenty-one 95 ninety-five

基数词三位以上的数词, 在百位和十位之间,一般要用连词“and”。例如: 132 one hundred and thirty-two.

1340 one thousand three hundred and forty

表示“万”的词英语中没有。如1万可用10千来表示:ten thousand。30万可用 three hundred thousand 来表示。

基数词的用法:

从句子成分上分析~基数词在句中可用作主语~宾语~表语等。

Four of them went to the factory. 他们四个人去了工厂。 (主语)

I want two. 我要两个。(宾语)

There are thirty classrooms in our school. 我们学校有三十个教室。

My classmate is eighteen. 我的同学十八岁。

knowledge, Zhuang Shaozhen said pro-democracy work, lecturing is in charge of the underground. In addition, singing revolutionary songs of the Taihang mountains and the Yan ' an ode. Underground activism attracted the attention of reactionary forces, one day, Dong Ling Yuanpei (head of the Youth League of the Wujiang), suddenly the field "inspection", then in establishing the Middle circuit Education Office Wujiang, anti-communist activities

He is only three, and he can't dress himself. 他只有三岁,不会穿

衣服。

从事物内容上分析,基数词用在下列情况。

1) 编号的事物用基数词。

Today we are going to study Lesson Five. 今天我们要学习第五课。Please open your books at page ten. 请打开书,翻到十页。 We live in Room 101. 我们住在101房间。

They study in No.28 Middle School. 他们在二十八中学校学习。 2) 表示“年,月,日”时用基数词。

The accident took place in 1982. 这次事故发生在一九八二年。 I was born in Oct.11,1956. 我出生在一九五六年,十月,十一日。 You could see many flowers in June. 六月份你可以看到好多花。 3) 表示“几点钟,几点过几分”用基数词。

It's three o'clock. 现在是三点钟。

It is two to two. 现在是两点差两分。

We arrived in Beijing at five to seven. 我们七点差五分到达北京。 4) 用于加减乘除的数字用基数词。

One plus two is three. 一加二等于五。

Eight minus four is four. 八减四等于四。

Two times two is four. 二乘二等于四。

Ten divided by two is five. 十除以二等于五。

5) 表示大几倍或者小几倍用基数词。

This river is two times longer than that one. 这条河比那条河长两

倍。

This box is five times less than that one. 这个盒子比那个盒子小

五倍。

Five times six is thirty. 五乘以六得三十。

6) 表示百分数用基数词。

Thirty percent of them is water. 它们当中有30%的水。 Eighty percent of what he said is true. 他的话有80%是真实的。

knowledge, Zhuang Shaozhen said pro-democracy work, lecturing is in charge of the underground. In addition, singing revolutionary songs of the Taihang mountains and the Yan ' an ode. Underground activism attracted the attention of reactionary forces, one day, Dong Ling Yuanpei (head of the Youth League of the Wujiang), suddenly the field "inspection", then in establishing the Middle circuit Education Office Wujiang, anti-communist activities

7) 表示分数时,分子数字用基数词, 但分母要用序数词, 如分子不是1,序数词要用复数形式。

One-fifth of the books are mine. 三分之一的书是我的。

Three-tenths of water is disappeared. 十分之三的水不见了。

8) 表示有小数的词用基数词。

5.5 five point five

12.135 twelve point one three five

序数词

序数词的定义

表示数目顺序的词用序数词。例如: first 第一,fifth 第五

序数词的构成

1—99的基本的序数词。

first 第一 second 第二 third 第三 fourth 第四 fifth 第五 sixth 第六seventh 第七 eighth 第八 ninth 第九 tenth 第十 eleventh 第十一 twelfth 第十二 thirteenth 第十三 nineteenth 第十九 twentieth 第二十fortieth 第四十 fifty-first 第五十一 eight-third 第八十三

ninety-fourth 第九十四

1) 序数词1—19 除第一,第二,第三,第五,第八,第九,第十二变化不规则外,其余均由在基数词后加上-th。

2) 十位整数的序数词的构成方法是, 是将十位整数基数词的词尾y 变成 i 再加 -eth。

3) 几十几的序数词,只是把个位数变成序数词,十位数不变。

为了更简单地记忆,你只要记住下面这个基数词变序数词口诀就可以了: 1,2,3全都变,9少e,8少t,ve变f,ty变成tie,th最后加上去。

序数词的用法

序数词主要用作定语,表语。前面要加定冠词the。

The first question I'd ask is how you knew him? 我的第一个问题是你怎样认识他的?

knowledge, Zhuang Shaozhen said pro-democracy work, lecturing is in charge of the underground. In addition, singing revolutionary songs of the Taihang mountains and the Yan ' an ode. Underground activism attracted the attention of reactionary forces, one day, Dong Ling Yuanpei (head of the Youth League of the Wujiang), suddenly the field "inspection", then in establishing the Middle circuit Education Office Wujiang, anti-communist activities

The fifth lesson is very easy to learn. 第五课很好学。

You are the first one I believe. 你是我最相信的人。

The fist round of voting hasn't finished. 第一轮投票还没有结

knowledge, Zhuang Shaozhen said pro-democracy work, lecturing is in charge of the underground. In addition, singing revolutionary songs of the Taihang mountains and the Yan ' an ode. Underground activism

attracted the attention of reactionary forces, one day, Dong Ling Yuanpei (head of the Youth League of the Wujiang), suddenly the field "inspection", then in establishing the Middle circuit Education Office Wujiang, anti-communist activities

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