数词

一，基数词one two three four five six seven eight nine ten eleven twelve

序数词first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth

二，序数词的运用

1. 一般要加the表示顺序, the First Lesson , the Third Floor

2. 有限定词时，不用the,

例如：This is Lily’s second pen.

It’s our first lesson.

Mary is my first teacher.

三，dozen, hundred， thousand，million和billion

1,当他们前面有数字时，后面不加S,

例如：

三打three dozen 三百three hundred 三千three thousand

2,当他们后面有加S时, 后面通常要跟of, 例如：

hundreds of 数以百计 thousands of 数以千计

millions of 数百万 dozens of 几打