内容正文:
数词
基数词变序数词口诀:
基变序,很容易,词尾加上-th;
一二三,特殊记,八加h,九减e,f来把ve替;
若是遇上整十数,ty变作tie;
若是遇上几十几,只变各位就可以。
数词的用法
1. 编号
编号可用基数词或序数词表示:
(1) 基数词位于名词之后,且名词首字母要大写
(2) 序数词位于名词之前,并加定冠词
eg:66路公交车:Bus 66、Bus No. 66或No.66 Bus
第100页:Page 100或the 100th page
332号房间:Room 332、Room No. 332或the No. 332 Room
2. 日期、年代
(1) 用基数词表示“年”,年代是四位数时,常先读读前两位数,再读后两位数。
Eg: 2023年 读作 twenty twenty-three
(2) 英语中通常为“月、日、年”
Eg: 2009年10月25日: October 25(th),2009
读作 October the twenty fifth, two thousand and nine
(3) 表达“……世纪……年代”时,在表达年份的阿拉伯数字后加-s或-'s。
Eg: 20世纪 90 年代:the 1990s或the 1990's 读作 the nineteen nineties
18 世纪 40年代:the 1740s 或 the 1740's 读作 the seventeen forties
3. 年龄: “几十岁”in one’s +基数词复数; at the age of...
Eg: My sister is twenty-three years old.
When he was in his thirties, he became a very famous actor.
She began to learn the piano at her age of five.
4. 时刻
(1) 整点:“整点时间+o’clock”;非整点:“整点数+分钟”
Eg: It’s seven o’clock.
It's seven twenty.
(2) 时刻读法:“整点数+分钟”;(分钟数小于或等于30分钟)“分钟数+past+整点数”;
(分钟数大于30分钟)“所差分钟数+to+下一整点数”
Eg: 6:30读作six thirty 或 half past six
8:45 读作 a quarter to nine
注意:15分钟常用a quarter,半小时常用half
5. 分数、小数、百分数
1 分数:分子用基数词,分母用序数词,分子大于一时,分母需用序数词的复数形式
eg:1/3:one/a third
2/3:two thirds
3/4:three quarters 或three fourths
2 小数:按照基数词的读法
eg:36.22读作thirty-six point two two
3 百分数
eg:88%读作eighty-eight percent (percent没有复数形式)
6. 倍数:“两倍”用twice/double,“三倍以上”用“基数词+times”,常用句型有:
1 倍数+as...as
Eg:We have produced four times as many computers as we did last year.
2 倍数+比较级+than
Eg: His uncle is twice older than he.
She has read three times more books than I have.
3 倍数+the+名词+of: 常见名词有size, height, length, depth, age, width, weight等
Eg: China is almost five times the size of Mexico in area.
7. “数词-可数名词单数(-形容词)”用作定语
Eg: a five-year-old child
a three-week visit to Singapore
8. 序数词前不用the或省略the的情况
1 表示“又一,再一”时
Eg: They wanted to try a second time.
2 序数词前有物主代词或名词所有格时
Eg: It’s my 60th birthday.
This is Lily’s twelfth book.
3 “序数词+名词”构成合成形容词时
Eg: There will be a second-hand c