Multiple choice

Directions: Fill in the blank.

He jumped into a ________ deep well.

  1. forty-foot

  2. forty-feet

  3. forty-feets

  4. forty-feat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a number and unit form a compound adjective before a noun, they must be hyphenated. The unit remains singular in hyphenated compound adjectives (e.g., forty-foot, ten-year, five-mile). Forty-feet would only be correct as a noun phrase after the article (a well of forty feet).

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