His last two books are written in English.他的后两本书是用英语写的 。
5、序数词及其用法
(1)序数词的缩写形式为阿拉伯数字加序数词的最后两个字母,如:
first—1st;second—2nd; third-3rd;thirty-first—31st
(2)基数词变序数词口诀
一,二,三要全变,如:
one-first; two-second;three- third
其余都加th, th里有例外,8去t,(eight-eighth) 9去e(nine-ninth)字母f代ve(five-fifth; twelve-twelfth)
ty变成tie(twenty-twentieth)
若要变化几十几,只变个位就可以(twenty-one-twenty-first)
6、基数词的用法
(1) 作定语、如:
There are only three boys in the class. 班上只有3名男生 。Ten people will come to the party. 十个人要来参加聚会 。
(2) 作主语 , 如:
It is said that thirteen is an unlucky number. 据说13是个不吉利的数字 。
Three of them will play football. 他们中有三人要去踢足球 。
(3) 作宾语 , 如:
It is worth three hundred. 这件东西值300 。
The city has a population of three million. 这个城市有三百万人口 。
(4) 作表语,如:
I am eighteen. 我18岁 。
Two and two is four. 二加二等于四 。
(5) 作同位语,如:
Are you two coming? 你们俩来吗?
They ten will go abroad. 他们十个人将出国 。
(6)有时序数词前面可加不定冠词来表示“再一” , “又一”这样的意思,如:
We'll have to do it again. 我们得重做一次 。
Shall I ask him a third time? 还要再问他一次吗?
When Nash sat down, a fourth man rose to speak.纳什坐下后,第四个人又起来发言 。
(7)作表语时,序数词前的定冠词往往省去,如:
Lynd was second last year. 林德去年是第二 。
7、在很多情况下,可以用基数词代替序数词来表示顺序 , 如:
the second part = Part two (第二部分)
the first chapter = Chapter one (第一章)
the fourth section = Section four (第四节)
8、倍数表达法
()1)基数词+倍数+形容词/副词比较级+than,用…times表示,如:
The girl is ten times cleverer than her brother.
(2)如果表示“是……两倍数”,一般用twice,如:
My room is twice as large as yours.
(3)基数词+倍数+as+形容词/副词/名词+as,如:
His apartment is three times as large as that of mine.
Americans eat twice as much protein as they actually need every day.
My aunt is as old age as I am. 我姑姑年龄和我一样大 。
(4)基数词+倍数+名词,如:
The volume of the Sun is about 1,300,000 times that of the earth.太阳的体积约为地球的1300000倍 。
(5)动词+基数词+倍数,用-fold或基数词加times表示,如:
The value of the stock has increased two-fold since we bought it.
Productivity is increased three fold. 生产效率提高了两倍 。
The pants have shortened two times since they were bought.
(6)用double(翻一番)
2023.03.31
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