7.表示百分比的说法: 基数词+ percent

8.有些基数词可以构成固定词组, 如: one by one, twos and threes三三两两

9.基数词可以与度量单位连用: twenty meters deep, ten meters long, one hundred yards

10.分数的表示法: 分子用基数词, 分母用序数词, 若分子大于1, 则分母用序数词的复数形式, 如: one third, two tenths, two thirds. 有些分数可以用half, quarter表示, 如: three quarters

11.小数: 小数点读作point, 小数点前面的数字读作一个完整的基数词, 小数点后面的每位数字依次用基数词读出, 如: 3.4读作three point four, 0.2读作zero point two, 8.97读作eight point nine seven

12.某些数字的读法与写法, 如: $10.20读作ten dollars and twenty cents; 35O 读作thirty-five degree; -20O 读作twenty degree below zero或minus twenty degree; Napoleon III读作Napoleon the third; World War II读作World War two或the second world war.

13.年龄的表示方法:

a. The boy is ten years old.

b. The boy is at the age of ten.

c. He is a ten-year-old boy.

d. The boy is of ten years.

14. in one’s + 整十数的复数形式, 表示"在某人几十多岁的时候", 如:

a. He became famous in his thirties.

15. in the 1930s / 1930’s表示"在二十世纪三十年代"

16. 序数词前一般要用the, 但表示"又一,再一"的概念时, 序数词前也可以用a / an

a. They plan to buy a second house. 他们计划再买第二房子

四.选择使用数字或文字表示数的场合:

1.一般来说, 两位数以内的数目用文字表示, 超过两位数的数目用数字, 如:

a. There are forty-five students in our class.

b. There are about 2,100 students in our school.

2.在句首的数目多用文字表示:

a. One hundred and two voters are against the project.

3.基数词的复数形式多用文字表示:

a. There are three twos in six. 6之内有三个2.

b. He became famous in his fifties.

2.在句首的数目多用文字表示:

a. One hundred and two voters are against the project.

3.基数词的复数形式多用文字表示:

a. There are three twos in six. 6之内有三个2.

b. He became famous in his fifties

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