一、英語基數(shù)詞千位數(shù)以上的寫法規(guī)則是:
從數(shù)字的右端向左端數(shù)起,也就是從后往前數(shù),每三位數(shù)加一個逗號“,”。從右開始,第一個“,”前的數(shù)字后添加 thousand,第二個“,”前面的數(shù)字后添加 million,第三個“,”前的數(shù)字后添加 billion。然后一節(jié)一節(jié)分別表示,兩個逗號之間最大的數(shù)為百位數(shù)形式。例如:
2,648 two thousand six hundred and forty-eight
3,050 three thousand and fifty
5,324 five thousand three hundred and twenty four
53241:Fifty three thousand, two hundred and forty one.
532,410:Five hundred and thirty two thousand,four hundred and ten
5,324,100 Five million three hundred and twenty four thousand, one hundred
53,241,000 Fifty three million, two hundred and forty one thousand
16,250,064 sixteen million two hundred and fifty thousand sixty-four
5,237,166,234 five billion,two hundred and thirty-seven million,one hundred and sixty-six thousand,two hundred and thirty-four

二、百分數(shù)表示法
百分數(shù)用基數(shù)+percent表示
50% fifty percent 百分之五十
3% three percent 百分之三
0.12% zero point one two percent 百分之零點一二
這里的percent前半部per表示“每一”,cent這一后半部分表示“百”,所以百分之幾中percent不用復數(shù)形式。

三、表示不具體、不確切的時間,如世紀、年代、年份、月份時,用介詞in表示,表示具體確切的某一天用介詞on表示通常情況下morning,afternoon,evening等詞前用介詞in。但是,當這些詞前后有一修飾限定的詞作為定語,把它們限定為某一天早晨、下午或晚上時,介詞in應改為on。這里的修飾限定詞可以是介詞短語、名詞、形容詞、定語從句等。例如:
1.On a cold morning,the old man died lonely in his house.
在一個寒冷的早晨,這個老人孤獨地死在自己的房子里。
2.I don/’t want to be disturbed on nights when I have to study.
我不愿意在我必須學習的晚上被打擾。
3.The accident happened on the afternoon of July 7.
這次事故發(fā)生在7月7日下午。
4.We are to have a small test on Monday morning.
星期一早晨我們將進行一次小測驗。