Odie的英语课 453 Numbers: first, second, third

452 复习number 数字；号码phone number 电话号码room number 房间号credit card number 信用卡号码There are a number of things we need to discuss. 有许多事情我们需要讨论。Large numbers of bees have died. 大量蜜蜂死亡。The number of elderly is rising. 老年人的数量正在上升。序数词第1 first第2 second第3 third第4 fourth第5 fifth第6 sixth第7 seventh第8 eighth第9 ninth第10 tenth第11 eleventh第12 twelfth序数词前面通常要加冠词（如the）或所有格（my，your，his，her）It's her twenty-first birthday.这是她的二十一岁生日。在说/写日期的时候，会用到序数词，写的时候通常会用缩写，说的时候会用the...of...（但是不写出来）Today is 20th August.（读作 the twentieth of August）今天是8月20日。还会把序数词作为名词：I'm voting for the third.我投（票）给第三个。vote 动词，投票序数词还会用作副词：First, let me introduce you to my brother.首先，让我来把你介绍给我哥哥。请大家和我各读三遍It's her twenty-first birthday.Today is 20th August.I'm voting for the third.First, let me introduce you to my brother.