在英语中，数字的书写有以下规则：
基数词 ：表示数量的多少，从0到9分别是：
0: zero
1: one
2: two
3: three
4: four
5: five
6: six
7: seven
8: eight
9: nine
10: ten
20: twenty
30: thirty
40: forty
50: fifty
60: sixty
70: seventy
80: eighty
90: ninety
100: one hundred
1000: one thousand
1,000,000: one million
1,000,000,000: one billion
1,000,000,000,000: one trillion
序数词：
表示顺序或位置，从1到31分别是：
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
29th
30th
31st
大数字的分组：
在表示大数字时，通常采用三位分组的方式，例如：
123,456,789 读作 twelve million, three hundred and forty-five thousand, six hundred and seventy-eight
特殊表达
101: one hundred and one
102: one hundred and two
103: one hundred and three
2000: two thousand
3000: three thousand
10,000: ten thousand
100,000: one hundred thousand
1,000,000: one million
1,000,000,000: one billion
1,000,000,000,000: one trillion
这些规则可以帮助你在考研英语中准确、清晰地表达数字。希望这些信息对你有所帮助。