eighty + plural noun
数词直接放在复数可数名词前作定语，名词要用复数形式。
There are eighty students in the hall.
大厅里有八十名学生。
基数,位于七十九之后,八十一之前,用罗马数字表示为LXXX,阿拉伯数字为80。；八十个
the number 80
基数,位于七十九之后,八十一之前,用罗马数字表示为LXXX,阿拉伯数字为80。
The cardinal number occurring after seventy-nine and before eighty-one, represented in Roman numerals as LXXX and in Arabic numerals as 80.
My grandmother is eighty years old but still walks to the market every morning.
我奶奶八十岁了，但每天早上仍然步行去市场。
用法提示：eighty 在此作数词，表示“八十”，修饰 years old。
The library has over eighty books on ancient history.
图书馆有八十多本关于古代历史的书。
用法提示：eighty 作数词，与 over 连用表示“八十多”。
She saved eighty dollars to buy a new backpack.
她存了八十美元想买一个新背包。
用法提示：eighty 作数词，表示数量“八十”。
数词直接放在复数可数名词前作定语，名词要用复数形式。
There are eighty students in the hall.
大厅里有八十名学生。
表示某个整体当中的八十个，of 后面接带限定词的名词或代词，谓语通常用复数。
Eighty of the seats were already taken.
其中八十个座位已经被占了。
at 加数词可表示年龄，相当于 at the age of eighty。
My grandfather learned to swim at eighty.
我祖父八十岁时学会了游泳。
grammar · medium
易错句子My grandma is eightty years old.
正确表达My grandma is eighty years old.
英语整十数由词根加 -ty 构成，eight 在加 -ty 时要先去掉末尾的 t，所以是 eighty；不能按“eight + ty”直接拼成 eightty。
grammar · medium
易错句子My grandfather is eighty-year-old.
正确表达My grandfather is eighty years old.
数词短语作表语时用“eighty years old”，years 用复数、中间不加连字符；只有放在名词前作定语时才写成带连字符的 an eighty-year-old man。
grammar · medium
易错句子He is in his eighty.
正确表达He is in his eighties.
表示“八十多岁”这一年龄段要用复数形式 eighties，即 in one's eighties；单数 eighty 只表示数字 80，不能用来指年龄段。
百分之八十
Eighty percent of the students passed the exam.
百分之八十的学生通过了考试。
八十岁
My grandfather is eighty years old this year.
我爷爷今年八十岁了。
八十多岁
She is still very active in her eighties.
她八十多岁了仍然很活跃。
八十年代
That song was a big hit in the eighties.
那首歌在八十年代非常流行。
八万
The stadium can hold eighty thousand people.
这座体育场能容纳八万人。
Choose the next layer that will help you use eighty with more confidence.
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