eighty + plural noun
eighty 作数量修饰语时，后面的可数名词用复数。
The school has eighty new computers.
这所学校有八十台新电脑。
十乘以八所得的基数
the number 80, equal to ten times eight
十乘以八所得的基数
the cardinal number that is the product of ten and eight
Eighty is a good score in this game.
在这场游戏中，八十是一个不错的分数。
用法提示：这里 eighty 作主语，是名词，表示数字八十。
Please write eighty on the card.
请把八十写在卡片上。
用法提示：这里 eighty 作 write 的宾语，是名词，表示数字八十。
They counted to eighty in one minute.
他们在一分钟内数到了八十。
用法提示：这里 eighty 作介词 to 的宾语，是名词，表示数字八十。
eighty 作数量修饰语时，后面的可数名词用复数。
The school has eighty new computers.
这所学校有八十台新电脑。
表示年龄时，be 后面可直接跟 eighty，也可说 eighty years old。
My grandfather is eighty.
我爷爷八十岁了。
turn 后接年龄，表示某人到达某个岁数。
She turned eighty last week.
她上周满八十岁了。
percent 形式不变，谓语动词常与 of 后面的名词保持一致。
Eighty percent of the students passed the exam.
百分之八十的学生通过了考试。
grammar · medium
易错句子There are eighty student in the hall.
正确表达There are eighty students in the hall.
英语中数词后接可数名词时，名词必须用复数形式；汉语名词没有复数变化，所以中国学习者常漏掉 -s。eighty 表示大于一的数目，student 应写成 students。
grammar · medium
易错句子My grandfather is in his eighty.
正确表达My grandfather is in his eighties.
表示“八十多岁”的固定表达是 in one's eighties，必须用复数 eighties；单数 eighty 只表示确切的数目“八十”，不能用来表示年龄段。
grammar · medium
易错句子She is an eighty-years-old woman.
正确表达She is an eighty-year-old woman.
数词加名词作定语修饰另一名词时，要构成带连字符的复合形容词，且其中的名词用单数：eighty-year-old，不能写成 eighty-years-old。
八十岁
My grandfather is eighty years old.
我祖父八十岁了。
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。
八十度
It's eighty degrees outside today.
今天外面八十度。
每小时八十英里
The car was traveling at eighty miles per hour.
那辆车正以每小时八十英里的速度行驶。
八万
The stadium can hold eighty thousand people.
这座体育场能容纳八万人。
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年满八十岁
My mother turns eighty next month.
我母亲下个月就满八十岁了。