Apedia

Years Married American Girl Twenty Year Old Twenty Compound Singular

Idx 1972
Keyword old
Sub Entry Number 1
Type of Sentence
Error Sentence He is married to a twenty years old American girl.
Correct Sentence He is married to a twenty-year-old American girl.
Cloze Error Sentence He is married to a [[twenty years old]] American girl.
Cloze Sentence He is married to a [[twenty-year-old]] American girl.
Cloze Answer twenty-year-old
Choices twenty years old | twenty-year-old
Explanation

Use years old after the verb be: 'Sarah is eight years old.'

In front of a noun, use a compound adjective (WITH two hyphens and a singular noun): 'a three-week-old baby', 'a ten-year-old daughter'

Nouns of measurement ('year', 'week', 'gram', 'mile' etc) are always singular when used in compound adjectives: 'a ten-second silence', 'a six-minute wait', 'a five-mile race'.

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