eighty

eighty — noun

1. the number that comes after seventy-nine and is written as the digit 80.

1.名詞A2
釋義

the number that comes after seventy-nine and is written as the digit 80.

例句

Layla wrote the number eighty on the board for her classmates to copy.

eighty as a noun referring to the number itself

Adisa's grandmother turned eighty last week and had a big party.

同義詞
  • four score

    literary or historical use; made famous by Lincoln's Gettysburg Address, but not used in everyday speech

文法句型

eighty + plural noun

the number eighty

用法筆記

When used as a determiner, 'eighty' goes directly before a plural noun without 'of' — say 'eighty students', not 'eighty of students'. As a noun, it can be the subject or object of a sentence: 'Eighty is an even number.'

常見錯誤

❌My grandmother is eighty years.
✅My grandmother is eighty years old.
💡In English, stating a person's age requires 'years old' or 'years of age' at the end.
❌There are eighty of students in the hall.
✅There are eighty students in the hall.
💡'eighty' as a determiner goes directly before the noun without 'of'.

2. the numbers from eighty to eighty-nine, used when stating a person's age range i

2.名詞A2
釋義

the numbers from eighty to eighty-nine, used when stating a person's age range in years, the temperature in degrees, or a historical decade — for example, someone who is in their eighties is between 80 and 89 years old.

例句

Lakshmi's great-aunt is in her eighties but still runs a small shop.

in one's eighties — age range

The temperature climbed to the high eighties during the summer heatwave.

in the high eighties — temperature range

文法句型

in one's eighties

in the eighties

in [her/his/their] early/mid/late eighties

用法筆記

This sense always uses the plural form 'eighties'. Never use the singular 'eighty' for this meaning. Common patterns: 'in one's eighties' (age), 'in the eighties' (temperature or decade), and 'early/mid/late eighties' for more precise ranges. The decade sense refers specifically to the 1980s.

常見錯誤

❌My uncle is in his eighty.
✅My uncle is in his eighties.
💡The plural form 'eighties' is required when talking about an age range from 80 to 89.
❌The temperature is in the eighty.
✅The temperature is in the eighties.
💡Use the plural form for temperature ranges as well.