Question

Choose the sentence (s) which is/ are punctuated correctly. 

1. Our daughter will be three years old next week.
2. Our son will be two-years-old next week.
3. Our two-year-old is starting to talk.
4. Our two year old is starting to talk.

Options

• I, III

• I and IV

• II, III

• III

Answer 1

I and III 'Two year old' (without hyphens) is a predicative adjective form. So, I is correct and II, incorrect. 'Two-year-old' (with hyphens) is an attributive adjective form which is used before a noun; its noun is understood in the context. So, III is correct, and IV incorrect.
Hence, I and III are the correct answers.