1. Compound adjectives and compound nouns with numbers.
I am a working mother of a nine-month-old girl.
Our five-year-old often talks obsessively.
Note that in these compounds the word that comes after the number is always singular.
Not:
I am a working mother of a nine-months-old girl.
Our five-years-old often talks obsessively.
Complete the second sentence so that it has a similar meaning to the first sentence.
For example:
My daughter is nine months old.
I have a nine-month-old daughter.