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［误］ Twofifth of the books are sold out.

［正］ Twofifths of the books are sold out.

［析］ 分数表示法，分子用基数词，分母用序数词，但分子大于1时，分母要在序数词后加s。

［误］ Tom was born on July eighteen.

［正］ Tom was born on July eighteenth.

［析］ 月日的表达法有美语和英语两种。　 美语 July 18 读作 July eighteenth　 英语 July 18th 读作 July the eighteenth

［误］ I'll go to school at 7∶30 a. m. in the morning.

［正］ I'll go to school at 7∶30 a. m/ at 7∶30 in the morning.

［析］ a. m 即表达在早上之意，不要再用in the morning.

［误］ The film will begin at three quarters past one.

［正］ The film will begin at one quarter to two.

［析］ 大于30分钟时不要使用past，而要用差多少不到几点的to来表达。

［误］ Three time three is nine.

［正］ Three times three is nine.

［析］ times 此处作为”乘“讲一定要加s。 　英语中乘除法表达式如下：

算法 种类 例 句

加法 一般 Five and six is eleven.

正式 Five plus six is (equals) eleven.

减法 一般 Eight take away four leaves (is) four.

Four from Eight leaves (is) four.

正式 Eight minus four equals (is) four.

乘法 一般 Three fours are twelve 3×4=12

正式 Three times four equals (is) twelve.

一般 Two in to four is two.

正式 Four divided by two equals two.

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